Yes, it looks like I'll have to go 134a. There's no r12 around here. Dealing with the POA valve looks to be a pain as well. Hardly anybody does them now. They're all pushing the POA update. I'm not super concerned about originality, so maybe I'll look at that with a new Sanden compressor that can cycle. Does the system work at a reduced capacity without recalibrating the old POA for 134a? Or does it not function at all?
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