How does one know if their POA has been upgraded? I ask because my car supposedly had been changed from 12 to 134. Leaks miserably. It has the new hose for 134 fitting. What does the POA for an R 12 system look like vs a POA for R 134? The POA on my car has a screw adjustment on it that, with a 1/4 turn I noticed, will change when the compressor kicks on/off.
Thanks
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