Last year I updated to R134 when my stock system was leaking R12. Replaced all hoses, fittings, compressor, receiver/drier, valves and larger condenser. Only stock part left is the evaporator. I'm not an AC expert, but I understand that an updated condenser makes a substantial difference in the system. I'm pretty happy with the results. Changing out the evaporator seemed to be a major undertaking for a marginal return on performance.
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