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High side vs Low side pressure

timsatx on Sat May 03, 2008 7:00 PM User is offlineView users profile

Year: 2000
Make: Buick
Model: Century
Engine Size: 3.1L
Refrigerant Type: R134a
Ambient Temp: 82
Pressure Low: ~120
Pressure High: ~120
Country of Origin: United States

Been here a few years ago with a Mercury Topaz I had problems with. Right after I fixed it I sold it and bought the car I have now, that was in 2003. I have not had a problem with the AC till recently. Three or four months ago I noticed that it was not cooling well. It has gotten progressively worse till now. It blows out some cool air, but not nearly enough to cool down.

I just broke out the gauges I bought back then and hooked them up. Basically it looks like I have the same pressure on both sides. After running it for a few minutes the High and Low side pressure was around 120. I just checked it after sitting for about 30 minutes and they are both about 100.

What do you think is wrong with it?

Dougflas on Sat May 03, 2008 7:03 PM User is offline

Is the clutch even engaged?

timsatx on Sat May 03, 2008 7:09 PM User is offlineView users profile

It would appear so. With it set on max I can turn it on and you can hear it click and when I turn it of you can hear it click again. When I turn it on to vent, if I turn the AC off you can hear it click and then the temps get warm. When I turn it back on you can again hear it click and then the air comes out cooler.

TRB on Sat May 03, 2008 8:36 PM User is offlineView users profile

V5 compressor. Could be a dead control valve. If it were in our shop. I would check for obvious leaks - reclaim - evacuate - recharge to the OEM specifications. If I have issues with it not charging correctly. I would swap out the control valve or compressor.

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timsatx on Sat May 10, 2008 9:12 AM User is offlineView users profile

Sorry to take so long to get back, busy week with school and work.

I guess it will be awhile before I can get back to it, I don't have a vacuum pump or UV detector kit. I would have to get them first. I certainly couldn't afford to take it to shop.

Can a vacuum be pulled on the system as it stands now without removing the coolant?

GM Tech on Sat May 10, 2008 12:17 PM User is offline

No need to remove the coolant (antifreeze) but you will have to remove any and all refrigerant in the a/c system to pull a proper vacuum.....

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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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