System Preparation

^ Review all Cautions, Warnings and A/C refrigerant system safety measures stated in appropriate model repair information.

^ Always use Underwriter's Laboratory (UL) approved refrigerant service equipment such as Kent Moore ACR3, ACR4 or equivalent.

^ Before proceeding with retrofit, perform a visual inspection and functional test of complete A/C system; including instrument panel outlet temperature, air distribution, refrigerant system components, system pressure and leak test. Repair/replace parts as necessary.

^ Before proceeding with retrofit, ensure all replacement parts, necessary special tools and equipment are available.

^ Always refer to the most recent parts information for affected models when replacing damaged or leaking R-12 refrigerant system parts (including the routine replacement of O-rings).

^ If replacement of damaged or leaking refrigerant components is necessary, blow compressed air followed by nitrogen through the remaining (except compressor), disconnected, free flowing system components before re-assembly in order to remove moisture, impurities and remaining refrigerant oil.

^ Any refrigerant system component replaced prior to retrofitting the system to R-134a requires PAG refrigerant oil to be added to the circuit.

^ All replacement compressors must be updated prior to installation and subsequent R-134a retrofit:
^ Nippondenso compressors, See Nippondenso Compressor A/C System in this bulletin.

^ Zexel compressors, See Zexel Compressor A/C System in this bulletin.