Guide to R134a Compressor Compatibility
the survivability of a given compressor when retrofitted to R134a has been heatedly discussed for several years. First we need to clarify whether we are discussing a CARQUEST remanufactured compressor or an Original Equipment (OEM) compressor that came with the vehicle. When considering retrofitting to R134a all CARQUEST compressors are up to the task, with the only recommendation being that the GM DA6 be replaced with an HR6 compressor. When it comes to OEM compressors the only guide that should be accepted as true would be the OEM guidelines themselves.
GM:
• The DA6 is not recommended for use after the 1987 model year for R134a use. The CARQUEST HR6 should be used to replace the DA6 whenever the customer considers retrofitting to R134a.
• GM reported that the R4, which appeared in pickup trucks from the late 1980’s to the early 1990’s and was designated as a 16-valve compressor, is not a candidate for retrofit. This compressor had a gold label attached to it from the manufacturer. The compressor should be replaced with a new, or a remanufactured CARQUEST R4 compressor.
• GM requires the use of a special V5 retrofit PAG lubricant for use with replacement GM OEM V5 compressors. The use of this special lubricant is not required on CARQUEST remanufactured units, therefore we recommend replacing the compressor to a CARQUEST unit.
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