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Compressor possibly bad?

azadam on Sat May 30, 2009 11:48 PM User is offlineView users profile

Year: 95
Make: Saturn
Model: SC2
Refrigerant Type: r134a
Ambient Temp: 90
Pressure Low: 75
Pressure High: 75

Ok, I'm stumped. My a/c system won't take a full charge and both high and low side pressures are the same. I put a remanufactured compressor in along with a new drier and expansion valve. Also flushed, evacuated, vacuumed, leak checked, and oiled the system prior to attempting the charge. No loss of vacuum over several hours @ 29.9hg's. The clutch kicks on once the system takes on some freon, and it seems to shut off and on as it should. Could the compressor itself still be bad even though the clutch is working properly? Is there a way to bench test compressors?

Phoenix, HellOnEarthAZ
1995 Saturn SC2

GM Tech on Sun May 31, 2009 8:17 AM User is offline

It's been my experience with those Rotary Vane comressors- that you have to get them "kick started" to make them pump- I charge them with a recovery machine- dump the entire system charge in, and try it-- Then if still no pumping, I overcharge them- still I generate some discharge pressures, then I remove the excess......

Rotary Vanes can be a PITA.. I have seen folks replace them- only to have same problem- because they don't know about "kick starting" them. They are really tough for a DIYer- since thay don't have a charging machine....

Seems the board is getting a lot of Rotary Vane complaints this Spring--do a search for Rotary Vane, or Saturn to join the club of Saturn A/C owner's problems.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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