Category Archives: ACtion Magazine

Are you ready for A/C season?


Reviewing the fundamentals: Pressures We started out with a brief review of A/C system pressure testing order to build up to the major point of the class which was the effect of variable displacement compressor solenoids on temperature and pressure … Continue reading

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Do you know how to find coolant leaks?


Finding Coolant Leaks Some days, around this time of year, it feels like all we do is chase down coolant leaks. Maybe that has something to do with weather patterns and large swings in ambient temperature. It may also relate … Continue reading

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Do you know your HVAC components?


  The first part of any good under-hood inspection should include a label check. The labels below provide us with refrigerant charge specifications to correlate to the OE specifications found in service information. Notice the specifications for the R-1234yf charge … Continue reading

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Installation and modification of A/C systems for US and imported vehicles


By Ward Atkinson Members have requested information regarding requirements that apply to vehicles produced by OEM vehicle manufacturers, commercial upfitters and independent A/C repair or service facilities that install or modify mobile A/C systems. All A/C refrigerants listed as acceptable, … Continue reading

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Spin-On Coolant Filters


By Chris Tyson, MACS Heavy Duty Contributor While rarely seen in automotive and light truck systems, engine coolant filters (sometimes called water filters) can be found on many over-the-road, heavy duty truck and off-road engine cooling system applications. While most … Continue reading

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The new world of HD and off-road equipment cooling


By Jerry Lemon, Lemco Mobile AC Consulting Welcome to the new world of HD and off-road air conditioning. There was a time, not that long ago, when the HVAC system in a piece of heavy equipment, or an over-the-road (OTR) … Continue reading

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Are you ready for A/C season?


This is the MACS blog site if you are looking for the MACS main website click here. Repair shops – one question: Are you prepared for A/C season 2018? Circle the right answer: YES – NO What do you mean … Continue reading

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The time for mandatory Section 609 recertification is now


The new refrigerant purchasing rules that took effect January 1, 2018 have had service shops, distributors and the MACS office in an uproar. At the MACS office, the faxes, emails, phone calls and mail deliveries never stop. Every technician wants … Continue reading

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Tariffs: A two-edged sword


By Keith Leonard, Esquire. While not for the first (or the last) time in United States history, the current administration has announced the imposition of tariffs on imported steel and aluminum (though not as to steel and aluminum imported from … Continue reading

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The mobile A/C industry on display


The MACS trade show has always been something special among automotive service exhibitions.  It’s a place where you see parts, tools and equipment for mobile climate control and vehicle cooling systems that you won’t see elsewhere.  And you usually first … Continue reading

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