Author Archives: macsworldwide

About macsworldwide

Mobile Air Conditioning Society (MACS) Worldwide Founded in 1981, MACS is the leading non-profit trade association for the mobile air conditioning, heating and engine cooling system segment of the automotive aftermarket. Since 1991, MACS has assisted more than 600,000 technicians to comply with the 1990 U.S. EPA Clean Air Act requirements for 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.

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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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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 … Continue reading

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School bus mobile A/C service and repair

The September/October 2020 issue of ACTION magazine is all about school bus A/C. Watch for it, coming soon! Visit our main website at

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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 … Continue reading

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Connector testing and repair

By Larry Turay In the previous issue, wiring harness issues were discussed. The subject of harness issues continues with a look at connectors and connections either in the harness or at a control module or component. Often a component or … Continue reading

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