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a/c not working when car is idling

dawnmac10 on Wed July 20, 2011 5:14 PM User is offline

Year: 2006
Make: Saturn
Model: VUE
Engine Size: 3.5L
Refrigerant Type: R-134a
Pressure Low: 70
Pressure High: normal
Country of Origin: United States

I have an a/c system that works better when pressing on the gas. Although today with high humidity (73%) and temps in the mid-90's, it did not feel like it was working even when driving on the expressway. It was not as hot inside the car as outside, but is was not comfortable after driving about 7 miles down the expressway.

The main problem is when idling at lights, or coasting along, the air turns warm, no cold air.

The station I go to added refrigerant and added dye about 3 weeks ago. Had the VUE checked for leaks, no dye is showing (doesn't mean there isn't a leak). I am told the fans work, the compressor works, the pressures for the most part are fine, although I noted in the info for this email the that low side reading is high (70 vs. I believe it should be around 40/45).

The refrigerant was sucked out and although a little difference, nothing significant was noted for the 2-3 weeks since the refrigerant was first added.

As this is my main vehicle for travel, I want to get it fixed and am facing a trip very soon.

Does this sound like the compressor (?) needs to be fixed? Thinking about it, I can say that last summer I did notice that the car seemed to not get as cold as usual, but really thought nothing of it....don't know if that detail helps.

Any thoughts would be appreciated. As many others gripped by heat here in the U.S., I just want my a/c to work!

TRB on Wed July 20, 2011 9:39 PM User is offlineView users profile

Low side 70 and high side Normal. I'm not buying that! What are the actual pressures at idle and 1500 RPM.


When considering your next auto A/C purchase, please consider the site that supports you:

bohica2xo on Wed July 20, 2011 10:27 PM User is offline

Scroll compressor.

Need high side pressure reading @ 2000 engine rpm.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Cussboy on Wed July 20, 2011 11:32 PM User is offline

You need to take real pressures as noted above, and make sure all the fans are working correctly in the engine compartment.

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