MACS 2021 Training Event: AGCO vehicles and mobile A/C repair clinic

Sherwood Wheeler of AGCO will present product updates on AGCO built products Including TSB information, product improvements, refrigerant capacity updates for new models and approved revisions during MACS heavy-duty and off-road program. AGCO produces the Massey Ferguson line of agricultural vehicles.  Additional topics to be covered will be useful A/C service tech tips and rule-of-thumbs, along with things to consider when troubleshooting and diagnosing A/C performance complaints.

Sherwood Wheeler-AGCO

Click here to view the entire MACS Training Program for the 2021 Training Event and Trade Show, February 3-6, in Orlando, FL at the Rosen Centre Hotel.

Click here to register to attend MACS 2021 Training Event at MACS website or call the MACS office at 215-631-7020 x 309, 313 or 311.

Click here
to reserve a hotel room at the Rosen Centre, MACS host hotel in Orlando, FL. MACS room rate is $195 (single or double plus tax) or call (800) 204-7234 or (407) 996-9840.

View the MACS website at

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MACS 2021 Training Event: Caterpillar Update Design, Features, Diagnosis and More

Where else but MACS annual Training Event and Trade Show can mobile A/C technicians get an update on the mobile A/C designs, features, diagnosis and troubleshooting directly from Caterpillar engineers?

Attend the 2021 MACS Training Event and Trade Show, Feb 3-6 in Orlando, FL and hear the latest from Caterpillar’s Dan Spurgeon and Erick Njos.

Dan Spurgeon-CAT

The Caterpillar training session will begin by covering the latest design and field service improvements, which are the result of extensive design and validation activities completed this past year. Then Erick Njos an electrical engineer from the Caterpillar climate systems team will conduct an in-depth exploration into A/C diagnosis and troubleshooting using real time machine data. Lastly, there will be a presentation of a new international standard for cabin air quality for mining equipment, which has implications that can impact heavy equipment OEMs, owners, operators and service providers.
Click here to view the entire MACS Training Program for the 2021 Training Event and Trade Show, February 3-6, in Orlando, FL at the Rosen Centre Hotel.

Click here to register to attend MACS 2021 Training Event at MACS website or call the MACS office at 215-631-7020 x 309, 313 or 311.

Click here
to reserve a hotel room at the Rosen Centre, MACS host hotel in Orlando, FL. MACS room rate is $195 (single or double plus tax) or call (800) 204-7234 or (407) 996-9840.

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How do I obtain a copy of my MACS or IMACA Section 609 credentials?

Section 609 certification credentials are good for life. This means they do not expire. If you were Section 609 certified and obtained your credentials from MACS or IMACA and have lost them, you may obtain replacement credentials by re-ordering them.

Use this form to apply for new credentials. Fill it out completely as the more information we have the easier it is to find your data record.

If you have applied to us for a reprint not in the MACS or IMACA databases, your deposit will be retained by MACS to pay for the search and other processing involved.

We suggest that you do not apply to us for a reprint unless you are sure that you have been certified by either MACS or IMACA. If you were certified by ASE, or another vendor you must call that vendor not MACS. Do not send in your form request more than once or you will be charged for every time we receive it.

You can fax your form with payment to to 215-631-7017 or mail it to:

P.O. Box 88
Lansdale, PA 19446

Questions? 215-631-7020 x 305, 309, 313 or 311

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MACS 2021 Training Event and Trade Show Technical Programming

Time to look at the advanced mobile A/C training offered at MACS 2021 Training Event and Trade Show! Due to the current COVID-19 circumstances we are planning the event with careful consideration and are including safety and security measures as we move forward to create a valuable training and networking experience.

MACS will have a variety of heavy-duty and off-road presenters beginning at 8 am on Thursday, February 4 with John Wagner of the Association of Equipment Manufacturers (AEM).

John Wagner will discuss how a group of dedicated individuals representing equipment manufacturers, air conditioning design, production companies and refrigerant manufacturers have worked together for the past two and a half years on U.S. EPA application for use of R-1234yf in certain types of off-highway,
work machines. The session will provide an update of the process, the application and the lessons learned as well as the uses of R-1234yf on off-highway equipment in global markets.

Click here to view the entire MACS Training Program for the 2021 Training Event and Trade Show.

Click here to register to attend MACS 2021 Training Event at MACS website or call the MACS office at 215-631-7020 x 309, 313 or 311.   Click here to reserve a hotel room at the Rosen Centre, MACS host hotel in Orlando, FL. MACS room rate is $195 single or double plus tax.

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Register now for MACS Section 609 webinar on November 12

Can’t attend a Section 609 class in person? Attend online with MACS on Wednesday, November 12 at 2pm. Can’t make it at 2pm the class will be recorded to view when you have time. Cost for the online Section 609 test and webinar is $45. Visit to register or call the MACS office at 215-631-7020 x 309, 313 or 311 to register.

Have you lost your MACS Section 609 credential and need a replacement?
Click here and follow the directions to obtain a new card. The replacement fee is $10.
Questions? Email

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Registration is now open for MACS 2021Training Event and Trade Show

Registration is now open for ACcess, the MACS 41st annual Training Event and Trade Show to be held February 3-6, 2021 at the Rosen Centre Hotel, Orlando, FL.

MACS is planning our 2021 Training Event with careful consideration to the current pandemic and is including safety and security measures as we move forward to create a valuable training and networking experience.

Attendees will gain ACcess to mobile A/C and engine cooling service and repair information needed to make accurate diagnosis and reliable repairs, while attending training sessionswith the experts in the field for in-depth A/C training for passenger car and light truck, HD truck and off-road vehicles. They will also enjoy ACcess to network with other mobile A/C professionals. In addition to three days of blockbuster training classes with 25 of the industry’s top trainers, the MACS 2021 Training Event includes a socially distanced trade show featuring the manufacturers and suppliers of A/C systems, components, tools, and equipment.

A golf tournament at Rosen’s Shingle Creek Golf Course sponsored by Omega/GPD/Santech and strategically planned, social distanced networking opportunities outdoors and indoors round out the program.

The 2021 Keynote Luncheon sponsored by MAHLE will reveal the new look and feel of the MACS organization. The result of a year’s worth of hard work and research, this presentation will be of particular interest to MACS members as the organization is positioned to take on the next 40 years.

A complete list of events for the MACS 2021 Training Event and Trade Show is available on the MACS website at and at this link:

Registration for the training event can be completed at the MACS website, or by phone at 215-631-7020 x 0 or by fax at 215-631-7017. Email inquiries can be sent to

It is time to make hotel reservations at the Rosen Centre Hotel, MACS host hotel. The MACS negotiated rate for a single/double occupancy room is $195 plus tax, per night. There is no resort fee! For reservations visit this link:
or call (800) 204-7234 or (407) 996-9840.

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Hazmats: Why should I care?

by Charlie Ayers

Trivia question: what do R-134a, Lithium Ion batteries, air bag modules, and used fuel system components all have in common? Aside from the fact that these are all in-use in today’s vehicles, they are all also classified as Hazardous Materials (i.e. hazmats) by the U.S. Department of Transportation (DOT). The same holds true for these products in Canada, where the governing body (Transport Canada) has similar designations for what they call ‘Dangerous Goods’ (i.e. hazmats).

Title 49, Code of Federal Regulations, Subchapter C (49 CFR) strictly regulates the transportation of hazardous materials. DOT requires individuals to receive initial (i.e. within 90 days of starting on the job) and recurring (i.e. at least once every three [3] years) training if they:

• Load, unload, or handle hazardous materials (such as those located in shipping and receiving)
• Prepare hazardous materials for transportation
• Are responsible for hazardous materials transportation safety, or
• Operate a vehicle used to transport hazardous materials (such as a parts driver)

Most, if not all, of the Original Equipment Manufacturers (OEMs) have published various Service Bulletins and communications* addressing this very subject. Why? Because today’s modern vehicles have many more hazmat components than they used to have (and the trend is to expect even more in the years to come). That, in addition to the ongoing Takata airbag recall efforts, have those of us in the vehicle service industry more aware of hazmat-handling best-practices than ever before. (Read more)

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Today, September 16, is World Ozone Day!

On 19 December 1994, the United Nations General Assembly proclaimed 16 September the International Day for the Preservation of the Ozone Layer, commemorating the date, in 1987, on which the Montreal Protocol on Substances that Deplete the Ozone Layer was signed.

States are invited to devote the Day each year to promote, at the national level, activities in accordance with the objectives of the Montreal Protocol and its amendments.

Please refer to the Ozone Day webpage in the OzonAction website for more information on world efforts to protect the ozone layer and our environment.

One way to help protect the ozone layer is to for professional automotive technicians working on mobile A/C systems to be educated in the proper procedures for refrigerant recovery and recycling through Section 609 certification with the Mobile Air Conditioning Society (MACS). Visit MACS website to complete this valuable training. Email us at Call us at 215-631-7020

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It’s on! MACS 2021 Training Event and Trade Show!

MACS is planning our 2021 Training Event with careful consideration to the current pandemic and is including safety and security measures as we move forward to create a valuable training and networking experience.

Why attend?

The early deadline to reserve a trade show booth is coming soon!

  1. A/Ccess to the mobile A/C and engine cooling service and repair information technicians need to make accurate diagnosis and reliable repairs.
  2. A/Ccess to the experts in the field who create repair processes, A/C systems, tools and equipment.
  3. A/Ccess to other mobile A/C professionals from manufacturing, distribution, service and repair and regulatory agencies.
  4. A/Ccess to top shelf mobile A/C training!

Click here for more information! Registration opens and the complete program will be available on November 1, 2020. Call 215-631-7020 x 306.

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Bringing in business in tough times

By Angie Chabot, AAM

As the world battles a pandemic, businesses, like yours, are battling to keep customers coming in the doors. Just when it seems that every penny must be spent wisely, it also is a prime time to look outside the industry for marketing ideas that can bring both current and future customers into your shop. Here are a couple that Stacy Tuschl, a local business marketing consultant and owner of two performing arts studios, provided recently during an interview with Social Media Examiner, a social media marketing blog.

Angie Chabot, AAM

Growing organic social media exposure

Tuschl dropped a number of social media tips during her interview, and this is one that works across any industry. Band together with a few other businesses that offer completely different services or products, such as florists, massage therapists, gas stations or dry cleaners, and create a giveaway or contest that each business promotes on its social media platform. The beauty of this type of partnership is that you will be cross-promoting each other’s businesses to a whole new set of audiences, ones who may have never heard of you before.

By limiting participation to only one type of business in the promotion, no one is competing with each other. Each participating business provides a prize or giveaway of predetermined equal value, and they are combined into one – or several – packages. Turn it into a scavenger hunt, or an online puzzle that people have to watch in order to find a daily question for the week. Whatever you and your band of fellow small business owners can come up with should be easy and fun for people to follow. But most of all, make sure it brings people in your door to learn more about your services. (Read More)

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Back to basics

by Steve Schaeber

There is no doubt that when it starts getting hot outside, your shop gets slammed with customers asking for help with their A/C systems. Same thing happens here at MACS, except we get slammed with A/C tech support calls.

Steve Schaeber

Most calls are really nothing special to talk about. Refrigerant charge amount, oil type and sensor locations are pretty common complaints, particularly for odd ball vehicles and trucks with limited information resources (and technicians unfamiliar with a particular make / model / system). We also get lots of requests for wiring diagrams and pressure gauge troubleshooting help. Plus, there’s many not-well-known TSBs that seem to keep coming up (Ford Escapes come to mind here).

Every once in a while, I get a tech call from one of our local member shops near MACS HQ. When it’s a really tough problem, I like to stop by and check it out for myself and (of course, I wear a mask and practice social distancing, in light of how things are today). (Read More)

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Understanding data lines (Part I)

By Larry Turay

Data lines and multiplexing have been with us in the heavy-duty world since 1990. The increased use of ABS, electronic ICUs, and automated transmissions to name a few, led the way that made the use of electronic control necessary for proper operation. Increased government regulations and tighter emission controls have led to updates and ongoing changes. Mainly with the introduction of emission controls; EGR, Aftertreatment, DEF and generic engine DTCs. A quick refresher on what multiplexing and data management is in order.

Larry Turay

Multiplexing is the combining of multiple signal outputs and switch or sensor inputs on a common circuit in order to reduce wiring complexity. Other advantages include automatic configuration of the vehicle for driving conditions, improved troubleshooting, customized parameters and configuration. heavy duty applications will use various data lines including J1708/J1587, J1939, and CAN that depend on multiplexing to operate.
Beginning with electronic engine controls introduced in 1990, the J1708/J1587 data line was used to communicate with the engine controls. Its purpose was primarily to convey fault codes and instrumentation. J1708 was the hardware standard for wire size, diagnostic connector, bus configuration, and so forth. J1587 was the communication standard, 8 bits per byte, 9.6 kbps, and a standardized language format. It is a bus style datalink using junction blocks. The J1708 datalink is identified by its green and orange twisted pair wiring. It runs at a slow rate of 9.6 bps, which was sufficient for its original purpose; transmit fault codes to a common connector to diagnostic tools. However, it soon became overburdened by its communication load. It was replaced for a short time by the J1922 datalink until the J1939 datalink was developed to support the increased datalink speeds. It continued to be on vehicles until 2016. (Read More)

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Are you a diagnostic detective?

By Pam Oakes, SME automotive professional

If you consider yourself a diagnostic detective see if you can solve this cooling system mystery before the end of the article!

Cooling Corner: The mystery of the 2008 Dodge Charger

Customers drive into our shops for maintenance, tires and corrective repairs. But every now-and-then even the most seasoned techs get a surprise. This is one of those times. 

While waiting for the car to cool-down, it was time to talk to the customer. The “20-Question” game is always an interesting exchange between the vehicle owner and the tech. Sometimes you get the background, other times just a bunch of “I don’t knows.” This time, the driver was a seasoned vehicle owner. He understood the “why” of the questioning and answered quickly. The take-away from the talk: He thought he saw antifreeze on his garage floor. He said that he topped-off the reservoir with water since he didn’t have any chemistry on-hand. But, he added, just about a cup-full. No more. (Read More)

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The 2020 September/October Action magazine issue is out!

School bus A/C service and technology

By Jerry Lemon, MACS Technical Correspondent

School is back in session, to some extent anyway, in most parts of the country. Now our thoughts turn to servicing the air conditioning on the buses, which are generally filled with up to 72 students. Full-sized school buses feature a mix of configurations from various manufacturers who try to keep the interior of a school bus comfortable in a wide range of operating conditions. Many rural school boards tend to run older buses, resulting in a number of challenges regarding servicing their systems, not the least of which is cost. These buses were likely originally equipped with the least expensive system available, not necessarily a system that even performed to the required standard. This story features an excursion through a complete refit/upfit for one of the older buses from a school district east of Dallas, Texas.

First, some background on the bus. This International bus came with a locally installed A/C system from a known supplier of school bus A/C systems. The district had purchased a number of these arrangements over the years and didn’t realize they performed poorly until they compared them to newly purchased Thomas bus systems, installed with the OEM supplied MCC air conditioning units. MCC purchased the Carrier line a number of years ago, and the basic design has not changed. They are the selected assembly line installed system for Thomas Bus. So, when the district purchased the Thomas buses, they compared the A/C performance to their existing buses … they found the existing buses were lacking. Although the district had tended to do all their own maintenance over the years to keep the A/C systems operating, they quickly realized this fix was beyond their capabilities. (Read More)

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Spend some time with MACS president and coo Elvis Hoffpauir

Hello, and Welcome to MACS Worldwide’s YouTube Channel. We’re glad you’re here! Elvis Hoffpauir Pioneer Experience MACS History! Elvis Hoffpauir, MACS president and chief operating officer, was presented with a 2019 MACS Pioneer Award at the MACS 2020 Training Event & Trade Show at the Gaylord Opryland Resort in Nashville, Tennessee on Thursday, February 20, 2020. This interview with Elvis was conducted by Steve Schaeber, MACS technical editor and manager of service training, via Zoom video meeting on May 14, 2020. Elvis has been involved with MACS since its inception, and organized all of the meetings, training events and classes that MACS held over the years. Elvis has authored many of MACS publications, including its Section 609 Technician Training manual. Elvis is current member of SAE’s (Society of Automotive Engineers) Interior Climate Control Standards Committee. In his younger years he served in the US Air Force, and was a writer and editor for several newspapers in Louisiana where he grew up. Elvis also worked for IMACA (the International Mobile Air Conditioning Association) and NARSA (the National Automotive Radiator Service Association) prior to the formation of MACS. He also played a key role in the formation of the Society during it’s developmental years of 1979 through 1981. Elvis attended school in Crowley, LA and the University of Southern Louisiana, now called the University of Louisiana at Lafayette. He served in the United States Air Force too. He received a 2006 Climate Protection Award from the US EPA for his work on the IMAC (Improved Mobile Air Conditioning) program during the early 2000s. He also received many journalism awards. For more information about MACS Worldwide, the annual MACS Training Event and Trade Show, and MACS Section 609 Certification program for mobile A/C service technicians, please contact MACS Worldwide at our website Thanks! Founded in 1981, MACS is the leading non-profit trade association for total vehicle climate and thermal management. Since 1991, MACS has assisted more than 1 million service technicians to comply with the 1990 U.S. EPA Clean Air Act requirements for Section 609 certification in refrigerant recovery and recycling to protect the environment. The Mobile Air Conditioning Society (MACS) Worldwide’s mission is clear and focused–as the recognized global authority on mobile air conditioning and heat transfer industry issues. For more information, please contact: © 2020 Mobile Air Conditioning Society (MACS) Worldwide Lansdale, PA (215) 631-7020

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Does your business have a social media policy?

If the last few months have taught us anything, it’s that without clear-cut policies in place, our world can quickly devolve into a chaotic spin. From extended personnel leave to sanitation and cleanliness, to business interruption policies, owners and managers have had their hands full jumping from one issue to the next. Unfortunately, I’m about to dump one more thing on your desk: your business’s Social Media Policy.
Understand that a social media policy is more than a list of do’s and don’ts. It’s a living document designed to outline the expectations and responsibilities of the people posting to your company’s social media accounts, as well as rules of conduct for the public on what is allowed on your business social media pages. This is important for several reasons:
● A business can maintain its brand identity across multiple channels.
● Legal and regulatory issues are handled with awareness and sensitivity.
● Security breaches can be prevented.
● A full-blown PR crisis can be potentially averted.
● In the event of a crisis or breach, staff can react and resolve a matter quickly.
● Employees and ownership are educated about their own social media responsibilities.
● Employees are encouraged to grow and amplify your business’s message.
Creating the policy

Angie Chabot, AAM

Like any business document, it’s best to start a Social Media Policy by covering the basics, including:

  1. What are employees’ roles and responsibilities in creating, posting and responding to social media on the company’s accounts?
  2. Who has access to these accounts?
  3. How often do passwords get changed?
  4. How often will social media managers get trained?
  5. What devices can be used to post on the company’s social media?
    From there, the next important issue to tackle is a code of conduct. Let’s assume your employees are trustworthy from this aspect, but the real concern is preventing your business from becoming the victim of trolling and smear campaigns.
    A social media page should be a place to share positive and informative content about your organization, and this policy should be communicated to visitors. State on your social media pages that your company reserves the right to delete any posts that contain material that is defamatory, harassing, illegal or off-topic. Provide the customer service contact information in your code of conduct policy, and remind followers that you are available to help and offer personal service offline.
    Staying within the law
    Your policy should also outline specific content requirements that will protect the organization from running afoul of the legal system, including:
    ● Copyright: Not everyone understands that using third-party content without approval is a breach of copyright law. Ensure staff have a clear understanding of what tools are available to them so they aren’t searching for artwork or other content that isn’t licensed.
    ● Privacy: Do all employees know how to handle customer information? Make sure your people don’t run into trouble without even realizing they’ve stepped over the line.
    ● Confidentiality: Do employees understand that certain internal information about your organization should not be discussed publicly? Even if staff sign nondisclosure agreements, they should be aware of the consequences of disclosing information on social media that the organization considers private. (Read more)
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Comparing the 2020 COVID-19 and 2003 SARS Pandemics

By Ward J. Atkinson, MACS Technical Advisor

When COVID-19 first appeared in the news, the U.S. general population wasn’t very concerned. Many assumed that like the SARS pandemic, it would only affect relatively few people.

The 2002–2003 SARS outbreak lasted about eight months. The World Health Organization declared that SARS was contained on 5 July 2003. During that time period, over 8,000 people were infected, and at least 774 died in 29 different countries and territories worldwide.

The COVID-19 has proven to be much more severe and it’s not over yet. This virus raises serious questions about the best way to clean a vehicle prior to service (protecting the service technician) and the best way to clean it after service (to protect the customer). 

The coronavirus that causes COVID-19 mainly spreads from person to person. When someone who is infected coughs or sneezes, they send droplets containing the virus into the air. These droplets can also be expelled when laughing or talking loudly in a crowded area when being close to others. You may also catch the virus if you touch a surface or object that has the virus on it and then touch your mouth, nose, or eyes.

Current evidence suggests that SARS-CoV-2 may remain viable for hours to days on surfaces made from a variety of materials. With different kinds of hard surfaces (such as metal, doorknobs, jewelry, silverware, drinking glasses, mirrors, and windows), the virus may last for up to 5 days. With plastic surfaces (such as milk containers, detergent bottles, vehicle interior, backpacks, elevator buttons), the virus may last up to 2 to 3 days.

Transmission of the virus through the ventilation and filtration systems, while possible, is less likely.

To reduce your chance of catching or spreading the new coronavirus, wear a mask to reduce possible person-to-person transmission and clean and disinfect common surfaces and objects at least every day.

Due to the complexity of the COVID-19 subject, the best approach is that the service technician needs to take all the precautions that they are comfortable to protect themselves when working on the vehicle.

Coronavirus and Temperature

Coronaviruses generally don’t live as long in higher temperatures and humidity levels as compared to cooler, dryer conditions. Researchers are studying exposure to heat, cold, or sunlight and how long the new virus lives on surfaces.

SARS was proven to be killed at 56°C (132.8°F) in 15 minutes according to the WHO (World Health Organization). 

The coronavirus can live for hours to days on surfaces. How long it survives also depends on the material the surface is made from. At this time there is no factual information on the required temperature and conditions required to kill SARS-CoV-2 on the various cabin material surfaces.

The family of viruses that includes the one that causes COVID-19 can live on some of the surfaces you probably touch every day.

*Researchers still have a lot to learn about the new coronavirus. But you’re probably more likely to catch it from being around someone who has it than from touching a contaminated surface. Refrence:

The U.S. EPA provides the following guidelines (

6 Steps for Safe & Effective Disinfectant Use

Step 1: Check that your product is EPA-approved. Find the EPA registration number on the product. Then, check to see if it is on EPA’s list of approved disinfectants at:

Step 2: Read the directions. Follow the product’s directions. Check “use sites” and “surface types” to see where you can use the product. Read the “precautionary statements.”

Step 3: Pre-clean the surface. Make sure to wash the surface with soap and water if the directions mention pre-cleaning or if the surface is visibly dirty.

Step 4: Follow the contact time. You can find the contact time in the directions. The surface should remain wet the whole time to ensure the product is effective.

Step 5: Wear gloves and wash your hands. For disposable gloves, discard them after each cleaning. For reusable gloves, dedicate a pair to disinfecting for COVID-19. Wash your hands after removing the gloves.

Step 6: Lock it up. Keep lids tightly closed and store out of reach of children.

List N from the EPA: Disinfectants for Use Against SARS-CoV-2

All products on the list meet EPA’s criteria for use against SARS-CoV-2, the virus that causes COVID-19.

The product container must have the EPA registration number and that human coronavirus is listed as a target pathogen.

These products are to be used only on hard nonporous surfaces.

Note: Inclusion on this list does not constitute an endorsement by EPA. Additional disinfectants may meet the criteria for use against SARS-CoV-2. EPA will update this list with additional products as needed.

Product Label: The companies list their product range and basic chemicals (active ingredients) used in the products.

The Current EPA List N: as of July 1, 2020 has over 430 products entries.

Figure 1: Spray Cleaners. This product, available at stores, is not currently listed to kill SARS-CoV-2.

Other Disinfecting Processes

Other disinfecting processes have been discussed that may have limitations and personnel safety concerns.

Infrared: May not be able to reach all vehicle surfaces for disinfecting. Proper use instructions must be followed for all approved sources.

Ozone generated air cleaners: Some studies show that ozone concentrations produced by ozone generators can exceed health standards even when one follows the manufacturer’s instructions. Many factors affect ozone concentrations including the amount of ozone produced by the machine(s), the size of the indoor space, the amount of material in the room with which ozone reacts, the outdoor ozone concentration, and the amount of ventilation. It is difficult to control the ozone concentration in all circumstances. Reference:

Use of High Temperature for Disinfecting

In general it is difficult to raise, in a closed vehicle, all cabin material surface temperatures to at or above 133°F (which is the temperature that has been shown to kill SARS virus by the WHO) using sun soak or sun and supplemental heat from the vehicle heater.

Coronaviruses generally don’t live as long in higher temperatures and humidity levels than in cooler, dryer conditions. Researchers are studying exposure to heat, cold, or sunlight and how long the new virus lives on surfaces.

There have been various proposals of using solar and/or vehicle heaters to increase interior cabin surfaces in temperature.

Solar and vehicle heating: Solar heating is limited to only warming surfaces in direct sun to high temperatures. Solar heating (radiation intensity) is affected by location and weather conditions within the US area.

Use of vehicle soak procedures by raising the vehicle interior temperature cabin surfaces have many issues: Vehicle cabin temperature can be increased using the vehicle heater. It is difficult to raise all cabin surfaces to same or potential required temperature to kill the virus. Use of solar and/or vehicle heater to raise cabin surface temperatures is not practicable to kill the virus.

Vehicle Test Results

The test results of these procedures of heating a passenger car cabin compare heating and solar is found below in Figures 2 to 7 and Charts 1 and 2. Eight cabin temperatures were recorded during a 78°F to 82°F day. It is important to note that the vehicle had a rear seat A/C outlet, which affected rear seat surface and floor temperatures when the vehicle heater mode was used.

Chart 1: Night Time Data: Temperature locations that reach 133°F.
Figure 2: Vehicle Breath: Air from A/C Panel Outlet Temperatures

* Note the 133°F marker on each graph.

Figure 3: Door Arm Rest: Center Console: Center of Instrument Panel Surfaces
Figure 4: Center of Rear Seat: Front and Rear Carpet Surfaces
Chart 2: Day Time Data: Temperature locations that reach 133°F.
Figure 5: Air from A/C Panel Outlet: Vehicle Breath Temperatures
Figure 6: Center of Instrument Panel: Center Console: Door Arm Rest Surfaces
Figure 7: Center of Rear Seat: Front and Rear Carpet Surfaces

Heater operation set for maximum temperature heat mode, airflow set for instrument panel A/C outlet air distribution. Vehicle equipped with automatic temperature control having rear seat A/C air outlet.

Automotive Service Concerns

The folloing excerpts are from an April 2020 letter the Mobile Air Conditioning Society (MACS) sent to U.S. regulatory agencies:

It is estimated in 2020 there are 287.3 million vehicles operating on roads throughout the United States. These vehicles are operated by more than 227.8 million motorists, serviced by 763,700 auto service technicians and mechanics at 166,000 different automotive service facilities in the USA, all needing protection from the coronavirus.

Each vehicle cabin is a small, self-contained, climate-controlled environment, which restricts movement, requires close contact of occupants, and repeated touching of interior surfaces.

Air conditioning panel outlets are close to occupants’ faces, directing air at the occupants face, mouth and nose.

The instrument panel surface can become contaminated by breathing/coughing of front seat occupants. Panel A/C outlets airflow will pull air from the panel surface, mixing it and delivering it toward the cabin interior.

The climate control system in vehicles present different challenges, as compared to a residential environment. Operation of the system allows the selection of 100% exterior (outside air) and cabin recirculated air. In the recirculated mode, system A/C designs for the amount of outside airflow can vary. The number of air exchanges per hour may be less than many household applications. Typical industry requirements, for a home, are in the range of 4 to 6 air exchanges per hour. Some mobile A/C systems operating in the MAX cooling mode (recirculated air) have provided at least 6 exchanges per hour.

The velocity of airflow directed onto the occupants is usually much higher than in residential systems.

There are a large variety of filters in some mobile A/C systems that require servicing and some vehicles have no air filter.

There is also concern for cleaning vehicles after the vehicle has been entered by others, for oil changes, for maintenance activities or valet parking.

Cleaning Procedures and Chemicals

The following is a collection of COVID-19 information on cleaning vehicles that is available to the public from different sources.

It is notable that references are made.

  • “Consult the cleaning information provided by the vehicle manufacturer”
  • Caution on using full strength bleach or hydrogen peroxide. They can kill      coronaviruses on surfaces, but may damage upholstery and interior trim.
  • Some general information listed have been suggested since March 2020.
  • New information and products may provide information and procedures for sanitizing vehicles and should be considered for vehicle cleaning.
  • Alcohol solutions that contain at least 70% alcohol are effective against coronavirus, according to the CDC.
  • Never combine cleaning chemicals as doing so may lead to toxicity.
  • Testing an out of sight surface with the selected cleaning agent is advisable in case of possible damage.
  • Cleaning with a microfiber cloth materials may help remove dirt from surfaces.

One major supplier of automotive interior parts, indicate that their company’s products, “from plastic trim to painted chrome to imitation leather, have been tested to ensure they don’t degrade when exposed to pure isopropyl alcohol.”

Do not use ammonia-based cleaners on car touch screens, as they can damage their anti-glare and anti-fingerprint coatings.

“Friction from cleaning also participates in the destruction,” says Stephen Thomas, M.D., chief of infectious diseases and director of global health at Upstate Medical University in Syracuse. “You want to do the best with what you have, so even soap and water can chip away at the risk.”

Soap and water are safe for most car interiors including fabrics and older leather that may have begun to crack. Excess amounts of cleaning solutions, such as water and soap can result in soaking through the cloth surface into the seating material and the potential of future odor problems.

Vehicle High Touch Areas:

  • Car keys and fobs
  • Door handles and lock buttons
  • Steering wheel
  • Shift lever
  • Wiper and turn signal levers
  • Controls for touch screen accessory controls
  • Center console contents
  • Armrests
  • Seat belts
  • Headrest
  • Seat pockets
  • Handles
  • Seat adjusters

Wash your hands before and after driving

When outside the vehicle wear gloves. Contact of high traffic surfaces that are not disinfected, when opening and closing doors, keypads, signing charge card pads and fuel nozzle handle when pumping gas.

About MACS Worldwide

Founded in 1981, MACS is the leading non-profit trade association for total vehicle climate and thermal management. Since 1991, MACS has assisted more than 1 million service technicians to comply with the 1990 U.S. EPA Clean Air Act requirements for Section 609 certification in refrigerant recovery and recycling to protect the environment. The Mobile Air Conditioning Society (MACS) Worldwide’s mission is clear and focused–as the recognized global authority on mobile air conditioning and heat transfer industry issues.

It is a mission we have been fulfilling for our growing global membership and the industry in the following ways:

Providing accurate, unbiased technical training, and compliance programs for the mobile air conditioning and heat transfer industry.
Providing a forum for exchange of trade information on a regional, national and international basis.
Facilitating business between all segments of the industry.
Providing tangible value for members, such as product marketing, promotion and money-saving affinity programs.
Disseminating legislative, regulatory and trade information (including data, current developments and training materials).
Providing information on legislative and regulatory initiatives that affect the industry and advocate for the industry to legislative bodies.

Visit our website for more information or call (215) 631-7020.

And as always, Thanks for Reading!

Edited by: Steve Schaeber, MACS Technical Editor on 7/13/2020

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What is MACS membership? Why should I join?

Membership in the Mobile  Air Conditioning Society (MACS) Worldwide means you pay a fee annually to receive all of our publications and  benefits, such as our Mobile A/C Diagnostics App, access to a helpline, health insurance, business insurance, discounts on Lenovo computers, GE appliances, UPS, Yellow Freight and services from Cintas, including  uniforms, parts washers, first aid cabinets, AED stations and more.

Many people think when they pass the Section 609 certification class that they are members of MACS. MACS Section 609 Certification is the EPA clean air act requirement, which is the regulatory credential needed to purchase refrigerant and recover and recycle refrigerant. MACS membership, however, is the next step to connecting yourself to the mobile A/C and engine cooling system industry.

A very wise, long-time MACS member once said, “MACS membership does not cost – it pays!” When you add up all the technical content, MACS Mobile A/C Diagnostics APP with Motor’s A/C and Spec library, clinic and convention discounts and business discounts, your membership in MACS pays for itself.

Since January 1 of this year, 67 new members have joined MACS. I hope by next month if you have not already joined us, you take the time to become a new member and help our organization be relevant and successful for the next 40 years.

Visit the Mobile Air Conditioning Society website at

Join here!

Call us at 215-631-7020 x 304.


Posted in #1234yf, #off road vehicles, ACtion Magazine, aftermarket career week, Environmental Protection Agency, MACS Member, MACS Training Event | Leave a comment

Free, Online, 2-night, Mobile A/C Class July 14 & 16

MACS member Carquest Technical Institute (CTI) is inviting you to a two-part HVAC Training Class. Tuesday, July 14 and Thursday, July 16 from 7- 9 PM  

In this class taught by MACS Board Member, Tim Iezzi of Iezzi’s Auto Service in Reading, PA you will learn the following:  

HVAC-4000-4 HVAC Update:   This HVAC Update class is designed to familiarize the shop and technicians with the current state of A/C service. While it is not designed as a complete A/C refresher course it touches on many foundations from previous courses and adds current information regarding new technologies, diagnostic techniques and the critical nature of HVAC systems today. Who should attend? Both technicians and customer service personnel.
Topics include: • Current equipment standards and how to verify capabilities. • The future with R-1234yf and how it will impact the service bays and customer satisfaction. • Real information on safety with new refrigerants. • Changes in leak detection and how to verify equipment operation. • A thorough review of the new service process and machines including video demonstrations. • A review of testing practices with added tools and techniques to save time and increase accuracy.  

To register Click here!


Posted in #1234yf, Automotive training, Refrigerants, Training | Tagged | Leave a comment

MACS Live Chat (Richard Hawkins and Steve Schaeber discuss Service Port Location)

This live chat features Richard Hawkins, A/C Tech line specialist and MACS technical contributor. Like many of you are during this Coronavirus Pandemic, all of us here on the MACS Staff are working from home and practicing social distancing to help flatten the curve. And part of that means that we’ve had to cancel and postpone many of our spring A/C training clinics. But we still want to do what we can to keep in touch with our members, and provide training for the industry, and as part of that, we’re producing these MACS Live Chats with some of our industry’s experts. we’ve developed a new webinar series where we’re going to cover A/C topics with some of our industry’s experts.

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Name That Hybrid Water Pump

By Dave Hobbs, MACS Technical Correspondent

While virtually every HEV (hybrid electric vehicle) has an ICE (internal combustion engine) along with one or more high voltage electric motors, not every one of them circulates the coolant in their engines the same way. Take Toyota for example. Up until its Prius line started using a 12-volt electric water pump (Figure 1) in 2010 and newer (Generation III) models, their little belt-driven water pumps (Figure 2) were prone to wear out around 120,000 miles. You’d hear a little rattle, then it would get a little louder, and before you knew it your customer’s water pump drive belt was almost shredded into smithereens. Call the parts store, and get a replacement water pump on the way to your shop, right?

Figure 1: The Generation III Prius (2010 and newer) ditched the tired out little mechanical water pump for a 12-volt electric pump. Your scan tool might have a bi-directional capability to operate this electric pump to test it and assist in burping air from the system during coolant refills. Photo credit: Gates Aisin
Figure 2: Prius models prior to 2010 (Generation II) were mechanical belt-driven pumps that tended to wear out between 100K and 150K miles due to use, noise and leakage.Photo credit: Gates.

Not so fast! When you call or go online seeking a new water pump, make sure you know what to order.

Hybrids and Cooling Systems
I’m driving a 2013 Malibu E-Assist (130-volt hybrid) with a mechanical water pump for the ICE and a 12-volt electric pump for the high voltage electronic components. The car uses the same GM coolant part number for both systems. My previous hybrid (2004 Generation II Toyota Prius) had identical attributes: a belt- driven mechanical water pump for the ICE with a 12-volt electric coolant pump for the power electronics. Again, the same Toyota long life coolant is used in both systems. Electric pumps are becoming a trend for both hybrids and conventional vehicles in an effort to remove the MPG / horsepower-robbing accessory drive belt. The use of electricity to run a cooling system pump is also helpful when the engine does a lot of stopping at idle (both HEVs and conventional powertrains with 12-volt stop/start systems). That way you can continue to move coolant into the heater core when the ICE is stopped at a traffic light. This can eliminate the need for yet another component – the not so uncommon 12-volt auxiliary coolant pump (Figure 3).

Figure 3: Many vehicles on the road today (not just hybrids) utilize a 12-volt auxiliary water pump to assist the main water pump in moving hot coolant through the heater core. Shown is an aux water pump for a GEN III Prius. Photo credit: Gates.

(Read more)

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Meet MACS Member Joey Rosato of Texas Truck A/C

Joey Rosato is second-generation and Director of Marketing for family-run Texas Truck A/C in Dallas, TX. Joey tells us, “It all started in 1996, when Nick Rosato (Joey’s Dad) set out on his own to work on trash truck A/C systems out of his pick-up truck. Since then, we have grown in and out of an entire facility, facility expansion, and currently run 10 service trucks. We are family owned and operated and have grown steadily in 2020. Family members include CEO Nick Rosato and President Marci Rosato. All of our business is centered around the proper function of interior climate control systems.”

Joey Rosato

Joey explains, “We perform repairs on all heavy-duty, off-road, truck, van, and bus applications. If the vehicle has a closed cab, we can keep it cool through our repair, maintenance and installation services. Our most recent unusual repair was on a 2015 Kenworth. The complaint was that the bunk had no air flow, and we diagnosed the issue to be one of the driver’s garments caught up in the blower wheel!”

The unprecedented times we are living in with COVID-19 has thrown us all a curve ball, and we asked Joey how Texas Truck A/C is dealing with it, “The largest challenge in this time of pandemic is overcoming the barrier that various guidelines have placed between us and our customers. At Texas Truck A/C, we view our customers as an extension of our team and family, so conducting business interactions in a way that keeps all parties comfortable has been a moderately difficult task, as we place our customers health and comfort above all other concerns.”

We asked Joey what is the one thing he could not run his shop without? “It would be impossible to run our business without proper air conditioning gauges, as different refrigerant types require specific gauges, and gauges are instrumental in diagnosing any repair. We have invested in diagnostic software programs that aid us in diagnosing advanced repairs, as they provide us deeper insights into the fault codes of different equipment types. More advanced diagnostic software programs, that provide insight directly specific to application, would be our primary wish list item. This would allow for premium efficiency when diagnosing certain advanced repairs.”

What should all shops consider in their business outlook? Joey told us, “We’d advise our peers to remain open to new ideas and perspectives, as times are changing, and the A/C industry is changing right along with them. We continue to find ways to better our operations through the employment of cutting-edge service technologies.”

Joey wants all of his customers to know, “One thing every customer should know about our repair shop is that we provide honest services that we stand behind. We’re transparent with our customers, and that has come to benefit us over time.”

Because Texas Truck A/C has been a MACS member for 22-years, we asked Joey what are the reasons his family has remained loyal? “We are a MACS member because we value the opportunity to grow and share information alongside our industrial counterparts. We believe in the sharing of news and knowledge between industry members for the sake of progress, and we feel that the MACS organization shares that belief.”

“Our favorite perk of being a MACS member is the opportunity to stay in touch with vendors and industrial partners alike. We enjoy the networking opportunities that the trade show offers, and always appreciate the opportunity to educate ourselves on the latest turns in the air conditioning industry.

We attend the MACS convention annually, as it provides our technicians with unique training and section 609 certification opportunities, while simultaneously offering networking opportunities for our managerial staff. MACS conventions have always been strong opportunities for our team members to learn and bond together; we always seem to return home a stronger team than we left. These conventions have become a staple in the annual Texas Truck AC event calendar. We’ll see you in Orlando, February 3-6, 2021!”

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MACS Live Chat (John Duerr & Steve Schaeber discuss A/C Leak Detection Tracer dye & COVID-19 in NYC)

Hi everyone, and welcome to another MACS Live Chat, hosted by Steve Schaeber, manager of service training and technical editor for MACS publications like ACtion Magazine and the MSR (MACS Service Reports).

Preview(opens in a new tab)

This live chat features John Duerr, Director of Product Development at Spectronics Corporation in Westbury, New York. Better known to MACS members as “TRACER PRODUCTS”, Spectronics is the world’s leading manufacturer of ultraviolet equipment and fluorescent dyes, producing cutting-edge, high-quality UV lamps, dyes, and diagnostic tools for the mobile air conditioning industry. John is also an active member of MACS and SAE, the Society of Automotive Engineers, volunteering on the Interior Climate Control Standards Committee.

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MACS talks to GDP’s Julian Hentze about mobile A/C parts, repair and more!

MACS Live Chat (Julian Hentze and Steve Schaeber discuss COVID-19, GPD and the Mobile A/C industry)

Hello, and Welcome to MACS Worldwide’s YouTube Channel. We’re glad you’re here! Hi everyone, and welcome to another MACS Live Chat, hosted by Steve Schaeber, manager of service training and technical editor for MACS publications like ACtion Magazine and the MSR (MACS Service Reports). This live chat features Julian Hentze, Vice President of Sales and Marketing at GPD (Global Parts Distributors) in Macon, Georgia. GPD is a leading national brand of aftermarket air conditioning system products with six locations across the US, servicng not just automotive and light trucks, but also heavy-duty vehicles as well. And they also have a wide variety of tech tips, product announcements, tools, videos, and more on their website which I refer to often.

Posted in #1234yf, Automotive, Automotive training, MACS Member, Mobile Air Conditioning, Refrigerants, Training, Uncategorized | Leave a comment

Stop complaining about the technician shortage…


By Elvis Hoffpauir C.O.O. MACS Worldwide

That was the principal message from Peter Meier, Director of Training at Motor Age. Peter, along with MACS Technical Advisor Ward Atkinson, joined moderator Steve Schaeber, Technical Editor and Manager of Service Training for MACS for a panel discussion on the subject during the recent MACS Training Event and Trade Show in Nashville.
Open almost any automotive trade publication over the span of the last 20 years, and you’re likely to find an article bemoaning the shortage of technicians. Such articles are usually long on “bemoaning” and short on solutions.
Peter made the point that it was time to quit waiting for someone or something to provide the solution, and for each shop owner to take the initiative in his or her own little corner of the world. “How many of you participate in your communities’ technical education programs? How many of you serve on advisory counsels for local training efforts?” Meier challenged. “It’s up to all of us in this room to address the need.”

Panelist Ward Atkinson introduced the MACS audience to the SAE Foundation and its mission to encourage and increase student achievement and participation in science, technology, engineering and math (STEM) to build a STEM-fluent workforce. Funds raised by the SAE Foundation support SAE International’s award-winning A World In Motion® (AWIM) program, Collegiate Design SeriesTM (CDS), awards and scholarships. Atkinson is one of the many industry leaders who have served as formal mentors and industry volunteers for AWIM and CDS students.
SAE’s STEM education programs enable students to develop the 21st century skills needed to succeed in real-world work environments and connect classroom learning with real-life application. SAE’s STEM programs have reached more than 6 million students worldwide and engaged more than 30,000 STEM industry professionals as volunteers. SAE International is a global association comprised nearly 200,000 engineers, technical experts and volunteers to advance mobility knowledge and solutions for the benefit of humanity.

“Building a STEM-fluent workforce can only be accomplished when all of us work together toward a single goal—filling the pipeline with students who have the experience and competency the industry requires,” said Lori Gatmaitan, SAE Foundation Director. “With our local partners, we place industry volunteers in classrooms to empower teachers with the critical resources they need to impact tangible and systemic change. AWIM and CDS provide students in all communities a pathway to STEM careers.”
SAE is the only organization with a comprehensive continuum of “Pre-K through College” Science, Technology, Engineering and Math (STEM) education programs.
By supporting these programs, along with SAE’s graduate and undergraduate scholarships and prestigious awards, the SAE Foundation continues to inspire the next generation of innovators.
Readers can learn more, by subscribing to the SAE Foundation quarterly newsletter at: (subscription form is located near the bottom of the page when you scroll down). Here is the general email and phone: (724) 772-8508,

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Helpful tactics to minimize the spread of Covid-19 in your service and repair shop

By Bill Snow, Radair Complete Car Care, Cleveland, OH

With today’s concern about being exposed to COVID-19 shop owners need to take additional steps to protect their team members and their clients.  In states that have issued a stay at home order, automotive repair businesses are deemed essential and many have decided to remain open to provide services to their customers, many of which are first responders and health care workers.


Here are some helpful tactics to minimize the potential spread of COVID-19.

  1. Offer pick-up and drop off service so that customers don’t have to come to your location.  Set some boundaries about time of day and how far you are willing to travel to get cars.  While you don’t have to advertise those boundaries, it’s good to know them so that you can best manage your workload and workflow.
  2. Promote and utilize your night drop box as an anytime drop box.  Many shops are seeing success using the night drop box as another way to offer a touchless experience.  After your customer pays, place the keys in their vehicle with the invoice.
  3. Close off or restrict your waiting room.  Drop off only.
  4. Have your team disinfect all customer reception area surfaces, bathrooms, and door handles multiple times per day.
  5. After your service advisor has checked in the car, have them disinfect all touch points, steering wheel, door handles, levers and gear shift knob.  Also, install disposable seat covers and floor mats.  Customers should only leave you with the vehicle key and clean it before your technician touches it.
  6. Require that your staff and technicians wear disposable gloves while at the shop and require that they change their gloves in between the inspection and repair of each vehicle. Gloves should be disposed of once they are used (do NOT reuse disposable gloves).
  7. Upon arrival each day, employee’s body temperatures should be taken and recorded.  Anyone with an elevated temperature or any signs of sickness should be sent home.
  8. If your shop provides loaner cars, make sure that they are disinfected before your customer takes them.  Your loaner cars reflect your business!
  9. Develop a note that can left behind in the car that states every precaution you took to ensure safety.  You can even ask for a referral!
  10. Prior to your customer picking up their vehicle, disinfect everything again.


Taking these steps will not only help your team and your customers reduce the risk of being exposed to the virus, but it will also help you stand out as a shop that cares.  During these uncertain times it’s our time to shine and show our communities that we are here to help.

Posted in Environmental Protection Agency, MACS Member, MACS Training Event, Mobile Air Conditioning, Training, Uncategorized | Leave a comment

How do I replace my MACS Section 609 credentials?

If you obtained your Section 609 certification credentials from IMACA or the Mobile Air Conditioning Society (MACS) Worldwide they can be replaced for $10.

Visit this link on the MACS website and follow the procedure for replacing your credentials. We must know your full name, where you worked and what city you lived in when you were certified, all this information helps the staff locate your record.

For more information you can call the MACS office Monday through Friday from 8:30am-5pm at 215-631-7020 x 313, 309 or 305.

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