I am definitely going back to R12. I looked over my new to me truck last night and the condenser is not original and much larger than stock. In fact, it is jammed under the hood latch plate and bent into a curve to fit. That ugly duckling is coming out. Now I am in the market for an R12 condenser if someone that converted to R134a has one lying around (and doesn't leak of course
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Also, to the person asking about Old Air recommendations, I am sure you cant go wrong if you follow their advice. Good luck.