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Re: POA VALVES AND R134 CONVERSION
Posted to HVAC Forum on 6/1/2020

No, I did not because the system was not left open and I did not have a leak. I was swapping out the 351C engine and transmission for the 521. I pulled a vacuum for half an hour and charged it. I was not concerned about the old oil in the system other than du... Login to read more.