MACS Issues Reminder On Refrigerant Usage in Mobile A/C Service – UnderhoodService

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 manufacturers’ 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; and 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

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