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

Sometimes, if it ain’t broke…


It’s easy for technicians to be misled by temperature and pressure readings, and what they think should be happening as a result of what they see. A high-mileage thirteen-year-old Mazda 626 isn’t cooling on an 85-degree day in New England. … Continue reading

Posted in Automotive, Automotive Aftermarket, Automotive training, Mobile Air Conditioning, Uncategorized | Tagged , , , , , , , , | Leave a comment

Download the September/October issue of ACtion Magazine


DOWNLOAD the digital issue of MACS  September/October 2014 ACTION Magazine to your desktop of mobile device. It is packed with great information and the just released program for MACS 2015 Training Event and Trade Show.

Posted in Automotive Aftermarket, Automotive training, Mobile Air Conditioning, Refrigerants | Tagged , , , , , , , , , , | Leave a comment

When you assign an A/C job to a non specialist


If your shop’s A/C  specialist is busy and you want to get the diagnosis started, you can assign the preliminaries to any technician in the shop. Here is what GM asks a technician to be able to provide when he … Continue reading

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Service managers: are you asking the right questions?


Too many technicians fail to get all the information they really need when a car comes in with a “poor A/C performance” complaint. Okay, not all motorists are observant, but you can at least try. The following are based on … Continue reading

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8 tips for A/C system preventive maintenance


1. Clean the front of the condenser.  The debris that builds up between the fins can really raise the head pressures, and that not only affects performance but can cause slipping of a clutch if voltage is marginal. If a … Continue reading

Posted in Automotive, Automotive training, Electrical/Electronic, Mobile Air Conditioning | Tagged , , , , , , , , | 1 Comment

MACS 2015 Training Event and Trade Show Program


MACS has put together the ultimate, total vehicle climate and thermal management, 3-day, live training event with the best instructors in the business. Download the program now and get a good look at the great training that is on tap! … Continue reading

Posted in #1234yf, Automotive, Automotive Aftermarket, Automotive training, Mobile Air Conditioning | Tagged , , , , , | Leave a comment

Actuator, actually.


By Paul Weissler, MACS Senior Technical Correspondent When  an  HVAC  case  electric actuator  fails  and you get a hard code, the fix should be straight- forward: replace the actuator. Ditto if a trouble tree calls for a new actuator. There … Continue reading

Posted in Automotive, Automotive Aftermarket, Automotive training, Electrical/Electronic, Mobile Air Conditioning | Tagged , , , , , , , , , | Leave a comment

4 tips on the relation of humidity to mobile A/C operation


Humidity should be a major consideration in  A/C performance tests. When humidity is very high, the A/C system expends most of its effort wringing the moisture out of the air. That’s the way it should be as we’re more comfortable … Continue reading

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Accurate refrigerant charge is essential


No automotive A/C  refrigeration system is completely tight, and cooling performance can  be marginal when the refrigerant charge is not correct. On today’s small capacity systems, that’s just a few ounces. One study showed that just a slightly low charge … Continue reading

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Evaporators, out of sight but not out of mind


By Paul Weissler, MACS Senior Technical Correspondent The evaporator is out of sight, but with A/C  technicians it can’t be out of mind. When you can’t find a leak anywhere else, it’s the part that becomes suspect. By now, experienced … Continue reading

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