A/C Charge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tdangle · 06-01-2021, 02:36 PM

I discovered a loose connection on my AC system and resulting leak. I need to recharge and am a little unclear on which pressure chart (low side) to use. R12 or R134. this is a totally stock system with recalibrated POA valve. When I filled the system 2 years ago, I just went by 80% of total volume as per the R134 conversion charts. Yes I changed the oil out to ester oil as it was compatible with both freons and if a residual amount of mineral oil remained. It has worked OK for 2 years.

Should I shoot for 40 to 50 at 80 degrees or 25-36 at 80?

Right now I put 1 12 oz can in and is right at 30 at not quite 80 degrees and center vent temp is 50 degrees.

06-01-2021, 02:36 PM	#1
tdangle Registered User Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,211	A/C Charge I discovered a loose connection on my AC system and resulting leak. I need to recharge and am a little unclear on which pressure chart (low side) to use. R12 or R134. this is a totally stock system with recalibrated POA valve. When I filled the system 2 years ago, I just went by 80% of total volume as per the R134 conversion charts. Yes I changed the oil out to ester oil as it was compatible with both freons and if a residual amount of mineral oil remained. It has worked OK for 2 years. Should I shoot for 40 to 50 at 80 degrees or 25-36 at 80? Right now I put 1 12 oz can in and is right at 30 at not quite 80 degrees and center vent temp is 50 degrees. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC



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