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replaced parts but ac not cooling

stevedak on Mon September 03, 2007 2:09 PM User is offline

Year: 1994
Make: saturn
Model: SL2
Engine Size: 1.9L
Refrigerant Type: 134
Ambient Temp: 85
Pressure Low: 15
Pressure High: 222
Country of Origin: United States

I replaced the compressor on my saturn, also replaced the dryer and expansion valve. pulled a vacuum, refilled the system and it worked fine. THe air temp from the duct was 40 deg F. The next day, the air temp felt warmer, I measured 50 deg F. While the duct air temp was 50, the low side was 15-18, the high side was 210-222, it kept changing back and forth every 15-20 seconds, the outdoor ambient temp was 85 deg and the engine was running about 2100 RPMs. From one day to the next, the duct temp went up by 10 deg but I didn't do anything to the system.

Can anyone help??

mk378 on Mon September 03, 2007 4:18 PM User is offline

Most likely, you have a leak. Did you install UV dye? The new parts and any connections you opened would of course be the first places to look.

stevedak on Mon September 03, 2007 6:48 PM User is offline

I did use uv dye, no leaks found. Also no pressure change from when it was good to when it went bad.

stevedak on Mon September 03, 2007 6:50 PM User is offline

I did use uv dye, no leaks found. Also no pressure change from when it was good to when it went bad.

A correction to my orginal post, the change in outlet air temp was about 4 days, the car was sitting at the airport.

TRB on Tue September 04, 2007 10:45 AM User is offlineView users profile

Pressures are low so either you have a leak, refrigerant level was low to begin with or your compressor is doing a poor job. You state you replaced the compressor. Was this replacement a new, remanufactured or wrecking yard special?

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stevedak on Tue September 04, 2007 4:09 PM User is offline

The compressor is rebuilt

stevedak on Tue September 04, 2007 4:13 PM User is offline

The compressor was rebuilt. The low and high pressures did not change even though the duct temps changed from 40 deg F to 50 deg F.

thanks for the help

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