I had one in my previous 911 (87 Cab) which had also been converted to R134 by the PO. The system worked fairly well but here in Dallas it gets really miserable in the summer. My current car is an 88 still on R12 with the upgraded Sanden compressor (no Procooler) and it works pretty good. Haven't see 100 degrees yet so it's hard to tell.
Buck
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