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A/c relieving after compressor change

old boredman on Fri June 20, 2014 6:08 PM User is offline

Year: 2008
Make: chevy
Model: Aveo
Refrigerant Type: 134a
Ambient Temp: 90°
Country of Origin: United States

Daughter told me the a/c quite working. hooked a pressure gauge to the low side and started the a/c and the pressure never moved. changed the compressor and added 3 cans of freon and started the a/c and the relief valve went off. noticed the low side pressure went in the red when the relief valve went off.

Dougflas on Fri June 20, 2014 6:51 PM User is offline

Did you change the accumulator, check/change the metering device, evacuate the system? What is the high side reading? Did you put the factory charge if freon in the system?

Edited: Fri June 20, 2014 at 6:52 PM by Dougflas

Jag987 on Fri June 20, 2014 9:43 PM User is offline

08 avea calls for 19 ounces of refrigerant. 3 12 ounce cans is 36 ounces. YES, I know all 36 will never make it to the system, but if charging from cans (not recommended) I would have stopped at 2. Being overcharged would explain why it is "relieving" and the low side pressure is "in the red." Having the system evacuated and recharged with the proper amount of refrigerant is where I would start.

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I bought a can of 134a at w**-mart that had a stop leak, oil, and dye in it. It also had a hose and a gauge, so now I'm an AC pro!

webbch on Sat June 21, 2014 2:40 AM User is offlineView users profile

Was the original compressor engaging? I'm just having trouble understanding how you came to the conclusion that the old compressor was bad.

old boredman on Sat June 21, 2014 7:31 AM User is offline

Thanks,
I'll just bring it to an expert.

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