Hello, I’m assuming that since the r134a Freon can connector tip slides over and connects onto both low and high pressure ports that it has already been converted? My understanding is r12 has a different style service port? Let me know if that not true. I kinda already shoved some 134 into the system but it was all at 0 psi. Ok that makes sense about the sight glass. After I posted this I wondered if that’s what it was
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