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Extensive vehicle fleet testing, followed by laboratory analysis of various vital parts of the air-conditioning systems, have been performed in order to develop a procedure for retrofitting existing CFC-12 automotive air-conditioning systems to HFC-134a. Testing shows that a compressor in good condition that has previously been used with CFC-12, can be re-used with HFC-134a provided that the appropriate oil, desiccant and elastomer is used. Testing has also shown that flushing the system is not necessary. The procedure in this paper was developed as a result of testing and proposes a procedure that will maintain an “acceptable” life of the compressor at a reasonable cost.

Traditionally there have been two types of automotive fixed-displacement air-conditioning compressors on the market. One is the wobble plate (single sided) compressor, and the other is an opposed (double sided) swash plate compressor. Due to the increasing demand for high speed, high performance, quiet compressors, a single sided, swash plate compressor with a fixed displacement was developed. This compressor combines the positive attributes from both types of compressors into a new superior product designed to surpass market requirements.