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approprite r134a compressor for NA 1992 ej22


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I transplanted a ej22 from a naturally aspirated 1992 legacy into my vanagon.

My vanagon didn't have ac and now I'm building an AC for it.   To keep it easy to maintain, the new system will be r134a.

My question: the legacy had R12 coolant.  what compressor should I obtain that will be appropriate for r134a, and fit my motor.

Nuisance considerations: will I need to modify or replace the compressor mounts and 4-notch drive pulley, and alternator mounts?



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