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LeeMonster,
Be careful. If the car has been converted to R-134a, it is required by law to have a sticker stating so. If you don't see that sticker, do not assume you have 134a. A p/o could have changed the original canister and recharged with R-12. If you dump 134a into a system charged with R-12, the oil is likely to break down and the compressor will fail. Compressor "black death" will contaminate your heat exchangers, and then you're looking at a bill of more than $1000 to refurbish the system.
Another visible difference between R-12 systems and properly retrofitted R-134a systems is the service ports. R-12 systems use a threded Schrader valve that looks like the type of valve used for tire valve stems. Your original compressor would have had two of these fittings on the compressor itself. R-134A systems use fittings with no visible threads. They accept a quick-connect fitting a lot like the fittings used with pneumatic air tools. Two of these, one with a red protective cap (high side fitting) and one with a blue protective cap (low side fitting), should be located somewhere other than on the compressor (you can unscrew the caps without the system leaking).
Good luck.
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'88 244GL, '89 244GL, '90 244DL, '91 244, '92 244
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