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Gauge pressure

fishman002 on Mon May 24, 2010 8:58 PM User is offline

Year: 1999
Make: Volkswagem
Model: Beetle
Engine Size: 2.0
Refrigerant Type: R-134A
Ambient Temp: 78
Pressure Low: 80
Pressure High: 100

I evacuated and recharged the system. It calls for 700 grams (454 grams per pound conversion rate) so I put in 24 oz of refrigerant. High side is 100 PSI and low side is 80 PSI at 78 F. Bad compressor?


Cussboy on Tue May 25, 2010 12:43 AM User is offline

That sounds like static pressure - like the AC compressor is not electrically engaged.

HVargas on Tue May 25, 2010 11:07 AM User is offlineView users profile

As Cussboy stated, sounds like the compressor isn't even engaging. Can you hear it kicking in? What was the original reason for the evacuate and recharge?


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mk378 on Tue May 25, 2010 11:18 AM User is offline

Your car has a SD7V16 variable displacement compressor. It's common for them to fail by being stuck at minimum displacement. It will turn but not compress, and get pressures like you have.

fishman002 on Tue May 25, 2010 11:23 PM User is offline

The system was on with those pressures, windows closed, a/c on max. I just bought the car and know nothing about it's condition so I evacuated and recharged just to verify the correct amount of R-134a.

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