MACS issues reminder on refrigerant usage in mobile A/C service

The 2011 mobile A/C service and repair season is approaching and the potential of increased cost of HFC-134a is a source of concern for the mobile A/C aftermarket. The concern is that market conditions will lead to improper refrigerant substitutions in mobile A/C systems.
The Mobile Air Conditioning Society (MACS) Worldwide strongly recommends the use of a refrigerant identifier during mobile A/C service to inform the technician of the chemical content of the refrigerant in a mobile A/C system and to verify the content and purity of refrigerant purchased in cylinders. “MACS recommends always using a refrigerant identifier when performing service on a mobile A/C system,” explained Paul DeGuiseppi, MACS manager of service training. “The refrigerant identifier should conform to SAE standard J-1771. My primary rule when working with refrigerants is, verify and identify. Verify that what you think is in a refrigerant cylinder is actually what’s in it and identify what is in a vehicle system before you begin work on it. This practice will allow for a proper repair and prevent possible contamination of mobile A/C systems or service and repair equipment.”

Current market conditions require the service industry to be vigilant when servicing mobile A/C systems and follow the vehicle manufacturer’s service requirements. If non-OEM approved refrigerants are installed in HFC-134a systems, possible concerns include:

  • System cooling performance
  • System reliability
  • Material compatibility
  • Chemical damage from blend refrigerants to system lubricant, seals and hoses
  • Contamination with lubricants required for blend refrigerants
  • Safety

Current mobile A/C systems are not designed to use flammable refrigerants. Using these may create additional concerns.

  • Under the U.S. Clean Air Act, any refrigerant blend that contains CFCs, HCFCs, or HFCs cannot be vented by anyone and must be recovered at service or vehicle disposal.
  • Only technicians certified under the U.S. Clean Air Act can purchase blend refrigerants that contain CFCs or HCFCs.
  • Service facility contamination from other refrigerants and contamination of shop tools including charging and recovery/recycle equipment is possible.


Equipment that is certified to meet the SAE standards and the Clean Air Act to service CFC-12 or HFC-134a mobile A/C systems should not be used to recover or recharge a blend or other refrigerant due to contamination and possible damage to the equipment and other mobile A/C systems.

For more information visit the resources page on the MACS website at

When having your mobile A/C system professionally serviced, insist on proper repair procedures and quality replacement parts. Insist on recovery and recycling so that refrigerant can be reused and not released into the atmosphere.

If you’re a service professional and not a MACS member yet, you should be, click here for more information.

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

The 32nd annual Mobile Air Conditioning Society (MACS) Worldwide Convention and Trade Show will take place January 18-20, 2012 at the Rio All Suite Hotel and Casino in Las Vegas, NV.

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.
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