AC R12 and 134a

Short answer: You don’t need a newer compressor — rebuilt GM A-6 compressors use seals/oil compatible with R-12 or 134a (confirm it’s freshly rebuilt). For a proper 134a conversion: use a kit to replace the O-rings, switch the whole system to Ester (not PAG) oil, change to a 134a-type dryer, and flush every component (compressed air + denatured alcohol, each part separately) to remove all old R-12 oil.

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