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 was enough to cause duct temperature to rise 3 degrees F, and significantly affect lubricant flow through the compressor.


In that case, the temperature at the A/C registers went up to 49 degrees F at 88 degrees ambient. So you might conclude, “nothing wrong with this system.” NOT TRUE!

Refrigerant top-off should not be considered a professional service procedure. Removing the refrigerant and installing the correct amount is the only way to insure proper cooling performance. Although that requires the service professional  to have a well-maintained refrigerant recovery and recycling machine with an accurate scale, there are no shortcuts when it comes to accurate charge.

If you’re a service professional and not a MACS member yet, you should be! Become a member and receive a technical newsletter with information like what you’ve just read in this blog post visit for more information.

You can E-mail us at . To locate a Mobile Air Conditioning Society member repair shop in your area. Click here to find out more about your car’s mobile A/C and engine cooling system.

Mobile A/C professionals should plan to attend 35th annual Mobile Air Conditioning Society (MACS) Worldwide Training Conference and Trade Show, Meet me at MACS Make Connections that Matter, February 5-7, 2015 at the Caribe Royale, Orlando, FL.


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.
This entry was posted in Automotive, Automotive training, Mobile Air Conditioning, Refrigerants and tagged , , , , , , , , . Bookmark the permalink.

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