Classes at MACS 2020 Training Event : Nissan and Infiniti New Mobile A/C Technologies

Some of the most highly anticipated classes at MACS 2020 Training Event are those taught by OEM representatives. MACS is happy to welcome Ed Simmons of Nissan-USA to present what is new in Nissan mobile A/C systems in 2020 and beyond including:

HVAC Systems to include the following:

R-134a transition to R-1234yf refrigerant on current and future models. 2019 LEAF electric vehicle climate control.

PTC heater booster system found on Titan diesel and LEAF vehicles. Networking of climate control systems.

Networking of climate control systems and more.

To register to attend MACS 2020 Training Event and Trade Show visit or call the MACS office to register by phone at 215-631-7020 x 304. Click here to see all the great mobile A/C training classes being offered.

Posted in Uncategorized | Leave a comment

HVAC Technology Changes that Make Modern A/C Systems more Challenging to Diagnose and Repair with Peter McArdle of Four Seasons

Peter McArdle
Four Seasons

One of the top-shelf A/C classes being taught at MACS 2020 Training Event is the challenge of change in mobile A/C with Peyter McArdle of Four Seasons. A myriad of changes to systems design and operation over the past ten to fifteen years can make diagnosing and  repairing a modern air conditioning system diabolically difficult. The greater  use  of  computer  controls  including  volume flow sensors, eVDCs (electronically controlled variable displacement compressors), electro-viscous fan clutches, evaporator thermistors, multi-speed cooling fans, active grille shutters, dual zone systems etc. can really darken your diagnostic day. Couple these technologies with changes in basic component design such as the use of flat  tube,  multi-pass, multi-path flow, sub-cooling condensers, idle stop evaporators, oil retention compressors etc. and it can be overwhelming to know where to begin your diagnosis of a poorly performing system.

“Join us for this class at MACS 2020 when we will explain some of these changes in detail and their impact on system operation and diagnostics. We will look at some of the issues and failures associated with these technologies and how best to cut to the diagnostic chase.”

Register now for MACS 2020 Training Event on the MACS website at

Posted in Uncategorized | Leave a comment

Training classes offered at MACS 2020 Training Event and Trade Show

MACS 2020 Training Event and Trade Show offers 32 different mobile A/C training classes, in the next blogs we are going to view them all!

Electrical Systems Power Management – Impact on HVAC Operation                                                                                                              

PETER ORLANDO Carquest Technical Institute

Winter Complaint “My rear defogger, heated seats and mirrors don’t seem to be working right.” Is it truly a systems malfunction or is the vehicle load shedding?

Summer Complaint “My A/C needs a charge.” Is it an A/C problem or is the vehicle load shedding? Can the HVAC system on a modern vehicle be telling us that there’s a bad battery on board? YES!

What percentage of time will the HVAC system be cycled OFF during a load shed level 3 event on a 2017 Chevy Malibu? Are there levels of load shedding? YES!

The customer’s awareness of this will begin gradually, and eventually they’ll bring the vehicle in for service. The technician will usually find ABSOLUTELY NOTHING wrong with the A/C or heating system.

The modern power management system on today’s vehicles is vastly different than just a few years ago. We are now measuring, calculating, and reporting the voltage, current, temperature, state of charge, health, and function across multiple networks to optimize vehicle performance. Ever realize you left the headlights on, and wonder how the battery didn’t go dead overnight? The answer is Power Management. However, as the vehicle begins to age, so does the battery. Consumer convenience of certain climate control system functions will be impeded, and at times, not appear to be working at all. The key to all of this is knowing what climate control systems functionality will be impacted by any electrical system deficiencies or degradation.

The class will include checking vital signs with a scan tool; load shed criteria and load reduction level counters; understanding net battery amp hours; proactive alerts: diagnostics and prognostics. Students that take this seminar will have a thorough understanding of domestic system load shedding, and the effect it has on HVAC system functionality.

To register for MACS 2020 Training Event visit the MACS website at

All MACS 2020 Training Event info is at this link.

Posted in Uncategorized | Tagged , | Leave a comment

Have you made your hotel reservations at Gaylord Opryland for MACS 2020 Training Event? Time is running out.

MACS Worldwide has made every effort to secure the best group room rate for you at the 2020  Training  Event  and Trade Show at the Gaylord Opryland Resort. The MACS negotiated rate for a single/double occupancy room is $199 plus tax and resort fee per night. For reservations, please go to the MACS 2020 Training Event page on our website for the reservation link, or call (888) 777- 6779.

Please remember to mention you are part of the MACS Training Event & Trade Show. Room reservations must be made by January 20, 2020, after which reservations and substitution request will be accepted only if hotel space is available. Please remember to keep your confirmation number. Please advise the hotel regarding any disabilities or special requirements. Check-in time is 4:00 pm and check-out time is 11:00 am. MACS attendees will receive a $5 discount on self-parking.

NOTE: Beware of bogus hotel reservation companies: MACS and the Gaylord Opryland Resort are NOT affiliated with any third party for booking hotel rooms. Should you be contacted to book your hotel room through a third party, please know this is likely a scam. Please report any suspect activity to MACS. Thank you.

Another thing to watch out for: Please ignore any unsolicited emails you may get from list brokers offering the full MACS 2020 registration list available for purchase through their organization. Please be aware that MACS never sells conference registration and contact lists to any brokers or third-party entities.

The MACS website is located at

To reserve a room at Gaylord Click here or call 888-777-6779.

Posted in Uncategorized | Leave a comment

MACS 2020 Training Event features a great tour for spouses and companions!

The Best of Nashville Tour!

Join a group of MACS attendees and spend the morning exploring Music City by bus.  Visit the Ryman Theater, the original home of the Grand Ole Opry and “The District” which is home to the coolest music venues and up-and-coming musicians.  Visit historic Centennial Park and the Parthenon, the only full-scale replica of the original Parthenon in Athens, Greece.   Get a look at the sights and historic landmarks of Music Row.  You might even spot a star to photograph.  Enjoy a stop for lunch on your own at the Nashville Farmers Market in Bicentennial Park.  The stars come out in the afternoon when you’ll have time to explore the County Music Museum and Hall of Fame. Learn more about your favorite country musicians from Gene Autry to Willie Nelson, Dolly Parton, Tammy Wynette and more.

Space for this tour is filling fast so register at MACS website at or call the MACS office at 215-631-7020 x 0.

Posted in Uncategorized | Leave a comment

Off-highway use of R-1234yf

By Steve Schaeber, MACS Technical Editor (29-MAY-2019)

It’s been a few years since R-1234yf started showing up in passenger cars and light trucks, and while that market is getting pretty much built out by this point, so far we haven’t seen it being used in anything else. Reasons for this are regulation (there is no current US mandate for low-GWP refrigerants, although new legislation has been proposed recently), incentive (there are no carbon credits for HD use) and permission (EPA has not yet approved its use beyond Class 3 vehicles). But a group of off-highway equipment manufacturers and their Tier1 suppliers (represented by AEM, the Association of Equipment Manufacturers) have been working towards getting it approved.

And if their SNAP application is accepted by EPA, R-1234yf refrigerant may soon be allowed for use in newly manufactured off-highway work machines.

Given the higher cost of yf and lack of requirements, you might wonder why companies would want to switch. But there are a few reasons, the first having to do with the F-Gas quota system in Europe. It’s a complicated scheme (based on 2015 usage) designed to limit the amount of high-GWP refrigerant being imported and used in EU member states. For example, in 2016 and 2017 they only allowed 93%, and for 2018 the amount was reduced to 63%. The gradual phase down will reach 21% of 2015 sales by 2030. This makes R-134a more expensive and harder to get in Europe.

Also, these manufacturers are not country-specific, as most of them build machines for sale around the world. This not only applies to US companies manufacturing products here in the US for export to other countries, but includes those who build off-highway machines for US import. R-134a is costly and hard to get in some regions, and if allowed by EPA it would be much simpler to use yf. Likewise, US manufacturers exporting to certain countries that ban HFCs must ship their machines empty and complete the A/C charging with yf upon arrival (since they can’t legally do this stateside).

The first step towards the SNAP approval process took place in early May, with several AEM and MACS members attending a meeting at EPA Headquarters. Led by AEM (who represents segments of the off-highway industry including agriculture, construction, forestry, mining and utility equipment) the group reviewed the risk assessment they had been working on over the last several months for the first machine configuration, which was agricultural tractors over forty horsepower. Other machine types (each of which require separate SNAP applications) include:

  • Agricultural tractors (under forty horsepower)
  • Self-propelled agricultural machinery
  • Compact, utility and turf equipment
  • Construction and forestry equipment
  • Compact construction equipment
  • Mining equipment

Essentially, they are asking EPA for the option to use either R-134a or R-1234yf as the industry sees fit for a certain application, expecting that more people will be using low-GWP refrigerants in the future. They have also conducted a risk assessment focused on any potential hazards to the operator, which includes items like cabin size, charge amounts, high pressure cutoff switches, pressure relief valve location, evaporator and seal testing, etc.

At this point (June 2019) we’re waiting to hear from EPA about further application requirements which may need to be completed. If there are none and EPA says the application is complete, then yf will be allowed after a 90-day waiting period. Official approval won’t come until EPA publishes their next rule (which we expect later this year) and is likely to include certain use restrictions similar to those used on passenger cars. EPA will also prohibit retrofitting with R-1234yf, primarily due to R-134a evaporators not being certified for use with an A2L refrigerant.

Note: We’ve also learned that activities in Europe have begun for Class 8 trucks to receive what the EU calls “Type Approval” for using yf in those vehicles. Right now, they’re still using R-134a in over-the-road trucks like we are in the US, and to date there has been no SNAP application for Class 4 through 8 vehicles. When that happens, MACS will keep you posted at our website. Thanks for reading!

Originally published in the July/August 2019 ACtion Magazine by MACS Worldwide.

©2019 Mobile Air Conditioning Society (MACS) Worldwide

For more information, please contact MACS at (215) 631-7020 or visit our website

Photo Credit: Photo by Steve Schaeber on 3/24/2017 shows an AGCO RT100 tractor with a fully enclosed operator cab, working on a field in Winside, Nebraska. Even on cooler days, operators working inside cabs like these need air conditioning to help counteract the “greenhouse effect” that takes place inside the cab due to solar radiation and heat rising off the engine and drivetrain components.

Posted in Uncategorized | Leave a comment

MACS salutes our American Veterans

The Mobile Air Conditioning Society (MACS) Worldwide salutes all American Veterans on this day of honor and remembrance.

Posted in MACS Member | Tagged , , , | Leave a comment

A lesson for the technician in a pre-post scan era

By Peter L. Orlando, Carquest Technical Institute/Advance Auto Parts

Pre-post scanning your customers cars? Be shop wise and understand the consequences of the outcome, as well as being service ready, if the customer says “OK, fix it!” (See scan tool report below.)

The car, a 2012 Lexus IS350C with the 2GR-FSE direct injected 3.5L engine (Figures 1, 2), was scanned during a routine service, and the shop noted two DTCs in the A/C system for the solar sensor circuit (Figure 3, highlighted in red boxes). They were “current codes,” and the technician advised the shop owner of his findings. This shop doesn’t perform any A/C service beyond basic refrigerant recovery and recycling, so they asked us to look at it.

Possible Deck - Orlando 1
Is there truly a problem with the solar sensor or its related circuits? If so, why are there no complaints about the A/C or heat from the customer? Is it possible this is normal behavior? This now becomes the quest for the shop searching for answers during a routine service. These are what I call service snags. If we are to investigate this issue, we must have a solid plan to ensure being paid for the service we are about to perform. If our exploration reveals evidence of normal A/C system behavior, what do we do then? What we don’t know can hurt us in the end.
Note: Although there were navigation DTCs, the shop didn’t concern itself with those DTCs, as they were history DTCs and not current.

Read more…

Posted in Uncategorized | Leave a comment

Introducing the MACS Pioneer Video Series

By Steve Schaeber, MACS Technical Editor (04-OCT-2019)

The Mobile Air Conditioning Industry Pioneer Award was originally established by IMACA (the International Mobile Air Conditioning Association) in 1988. In 2003, the Mobile Air Conditioning Society (MACS) Worldwide assumed the role of continuing the tradition of recognizing individuals who have made outstanding career contributions to the mobile A/C and heat transfer industry.


Now MACS is taking the prestigious award one step further, by sitting down with some of our industry’s most respected Pioneers to hear more about their stories first hand. Join me, Steve Schaeber, manager of service training and technical editor of ACtion Magazine, as I learn where the Pioneers grew up, where they went to school, and how they got started in this fascinating, wide-reaching business. We’ll talk about everything from the most obscure parts and theories of operation to the origins of well-known components that you might not have thought about before. I’ll ask some about their patents and inventions and ask everyone for their insight as to what the future of air conditioning may hold.

All of the MACS Pioneer Videos can be found on our YouTube channel or on our website Here’s a link to a playlist for all of our Pioneer Videos:

Thank You! To All of the Pioneer Participants!

Pioneer Award Nominations

Nominations for the Pioneer Award can be submitted to Elvis Hoffpauir, MACS president and COO by phone at (215) 631-7020 or emailed to All nominations are voted on and are at the sole discretion of the MACS Board of Directors.

Want to participate?

If you are a Pioneer Award recipient and would like to participate in the MACS Pioneer Video Series, please let us know! Interviews generally take about an hour and can be conducted at the annual MACS Training Event and Trade Show or at another MACS event.


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.

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.

Become a member of MACS today!

MACS represents a growing global membership, and is affiliated with MACS Partners (EU) and Vehicle Air Conditioning Specialists of Australia (VASA).

© 2019 Mobile Air Conditioning Society (MACS) Worldwide
Headquarters: Lansdale, PA
Phone: (215) 631-7020

In a new video series from the Mobile Air Conditioning Society, Steve Schaeber sits down with recipients of “MACS Industry Pioneer Award”​ to hear their stories first hand. Learn where the Pioneers grew up, where they went to school, and how they got started in this fast-paced, technology-filled business. These are From the most obscure A/C parts and theories of operation to the origins of the most well-known (but least thought of) components, we’ll learn first hand from the inventors and patent holders, technicians and shop owners, manufacturing engineers and Standards writers, and maybe even gain some insight as to what the future may hold for the mobile A/C business. Thanks for joining us!

Posted in Uncategorized | Leave a comment

Registration is now open for MACS 2020 Training Event and Trade Show

Registration is now open for ACcess, the MACS 40th anniversary Training Event and Trade Show to be held February 19-22, 2020 at the Gaylord Opryland Resort and Convention Center in Nashville, TN.

Attendees will gain ACcess to mobile A/C and engine cooling service and repair information needed to make accurate diagnoses and reliable repairs, while attending training sessions with 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 35 hours of blockbuster training classes with 36 of the industry’s top trainers, the MACS 2020 Training Event includes a trade show featuring the designers  and manufactures of A/C systems, components, tools and equipment. A golf tournament at Gaylord Springs and multiple networking opportunities in entertaining social settings like Nashville’s Wildhorse Saloon round out the event.

NASCAR driver David Starr will be the Keynote Speaker at the 2020 Training Event Keynote luncheon sponsored by MAHLE Service Solutions. Competitive, determined and passionate with over 20 years of racing experience under his belt, David Starr has proven himself as one of the top racers in the United States.

Starting out at his local Houston dirt tracks, David climbed the ladder gaining championships and victories under his belt. He learned the skills and mechanics behind racing on dirt and pavement, vaulted to success, and entered the then named NASCAR Craftsman Truck Series in 1998. Throughout a decade of racing, David has racked up wins in the Truck Series and competed for championships.

In 2014, David moved to the NASCAR Xfinity Series where he drove the #66 Toyota for Carl Long, as well as others such as AJ Foyt and NFL player Randy Moss. David currently competes full-time in the NASCAR Xfinity Series, driving the No. 52 Chevrolet Camaro for Jimmy Means Racing and part-time in the Monster Energy NASCAR Cup Series, driving the No. 51 Chevrolet Camaro ZL1 for Rick Ware Racing and the No. 97 Toyota Camry for Obaika Racing.

“David has been involved in racing since he was 14-years old and knows the business of racing inside and out. After spending time with him, we are convinced our attendees will be fascinated by a life-long driver’s perspective on the sport,” remarked Elvis L. Hoffpauir, MACS president and chief operating officer.

A complete list of events for the MACS 2019 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

MACS Host hotel reservations for the Gaylord Opryland Resort can be made by phone at 877- 491-7397 or on the hotel page of the MACS website. The MACS hotel room rate is $199 plus tax, single or double per night. Be aware: Neither MACS nor the Gaylord Opryland Resort will ever call you to book a hotel room. Please be alert to scammers looking to steal your credit card information.

Since 1981, the Mobile Air Conditioning Society (MACS) Worldwide has been the advocate for service and repair owners, distributors, manufacturers and educators making their living in the total vehicle climate and thermal management industry.

MACS Worldwide empowers members to grow their businesses and delivers tangible member benefits through industry advocacy with government regulators and by providing accurate, unbiased training information, training products, training curriculum, and money-saving affinity member services. MACS has assisted more than 1.2 million technicians to comply with the 1990 Clean Air Act requirements for certification in refrigerant recovery and recycling to protect the environment.

To learn more about MACS Worldwide visit our website at The MACS 2020 Training Event and Trade Show, A/Ccess will take place February 19-22 at the Gaylord Opryland Resort and Convention Center in Nashville, TN. A current calendar of all regional training can be found on the training page of MACS website.



Posted in #1234yf, ACtion Magazine, MACS Member, MACS Training Event, Mobile Air Conditioning | Tagged , | Leave a comment