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. www.macsw.org

Repeat blower motor issue


By Steve Schaeber, MACS Technical Editor An old boss of mine used to have a saying that goes something like: I ain’t got time to be doing the same thing two and three times! In fact, I can still picture … Continue reading

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US EPA, US DOT, California’s Air Resources Board Issue Draft Technical Assessment Report of Greenhouse Gas Emissions and Fuel Economy Standards for Model Year 2022-2025 Cars and Light Trucks


 The U.S. Department of Transportation (DOT), the U.S. Environmental Protection Agency (EPA), and the California Air Resource Board (CARB) today took the first step in the mid-term evaluation of the National Program for greenhouse gas emissions and fuel economy standards … Continue reading

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Change is coming to heavy duty refrigerants


By Steve Schaeber, MACS manager of service training Last year around this time the US Environmental Protection Agency (EPA) finalized Rule # 20, which was a Change of Status Rule affecting several industrial sectors including MVAC (Motor Vehicle Air Conditioning). … Continue reading

Posted in #1234yf, #off road vehicles, ACtion Magazine, Mobile Air Conditioning, Refrigerants | Tagged , , , , , , , | Leave a comment

Servicing heavy duty truck, off-road and specialty vehicle A/C


By Robert Brocx The heavy duty truck, off-road work machine and specialty vehicle mobile air conditioning (HD MAC) industry has typically utilized air conditioning standards, procedures and technologies developed by the automotive industry and SAE Interior Climate Control Standards Committee … Continue reading

Posted in #off road vehicles, ACtion Magazine, MACS Training Event, Mobile Air Conditioning, Refrigerants | Tagged , , , , , , , | Leave a comment

Dr. Mark Quarto to Keynote MACS 2017 Training Event – Feb 16, 2017


The role of mobile air conditioning (A/C) systems has dramatically changed as hybrid, plug-In hybrid, battery electric, extended range electric vehicle, and fuel cell vehicle technologies continue to populate the vehicle landscape. No longer strictly for vehicle cabin cooling, the … Continue reading

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Clogged radiator!


Johnny’s Radiator in Warren, AR is very busy right now and trucks with clogged radiators like this are one reason why! Make sure air flow is not restricted. If you’re a service professional and not a MACS member yet, you … Continue reading

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Do you know how to handle A/C for off highway vehicles?


  Like the light duty world, most heavy duty HVAC systems are tested using a laptop and specific software. However, the Freightliner M2 Business Class Truck HVAC controls and blower motor circuits can still be checked using common items found … Continue reading

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Where have all the “leakers” gone?


By Ward Atkinson, MACS Technical Advisor It has been said that back in the days of R-12, A/C system engineers sometimes used “Band Aid” fixes to address A/C system issues. Speaking as one of those early engineers, there is some … Continue reading

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Regulating recharge


By Steve Schaeber, MACS manager of service training Summertime is here, and that means many shops are feeling the full heat of A/C season. With temperatures rising, customers seeking cool rides, and to help them out (and keep their profits … Continue reading

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A new retrofit


Joe Randazzo of Randazzo’s Auto Service, Lansdale, PA invited us over to see his new retrofit of a 1987 Camaro I-ROC.   If you’re a service professional and not a MACS member yet, you should be! Become a member and … Continue reading

Posted in Automotive, Automotive training, MACS Member, Mobile Air Conditioning, Training | Tagged , , , , , , | Leave a comment