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29/03/2026 6:54 pm
Topic starter
Can I change to new ac refrigerant without changing compressor (assuming it doesn't leak)? Compressor clutch DOES engage in testing.
1993 Toyota Camry LE 6 cyl. 260,000 miles Auto Trans
1 Answer
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29/03/2026 7:29 pm
In theory you can keep your old compressor. In practice R134a runs at higher pressures than R12a which will put more strain on your 33-year-old compressor so it's a bit of a crap shoot. You do need to flush all of the old mineral oil out of the system (it's not compatible with R134a) and change the drier. This might also be a good opportunity to replace those decades-old AC hoses.
