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G6 AC sometimes won't turn on

DanD on Wed July 04, 2012 5:20 PM User is offline

Year: 2008
Make: Pontiac
Model: G6
Engine Size: 3.5
Refrigerant Type: R134A
Ambient Temp: 90+
Pressure Low: unknown
Pressure High: unknown
Country of Origin: United States

We have an 08 G6 coupe with the 3.5 liter engine. Up to this point, there has never been a problem with the AC. A few weeks ago, the AC worked fine when the wife went to work in the morning, then nothing on the way home. I looked it over, checked fuses and relays that seemed to have anything to do with the AC and all were fine. When turning on the AC, the engine cooling fan immediately started running like it should, but the compressor was not running at all. When the refrigerant is low, I've always seen the compressors click on and off as they're trying to work, but they shut down due to low refrigerant. That was not the case I said, no action from the compressor at all. Finally, I unhooked the battery for a few minutes and after hooking it back up, the AC worked flawlessly for a couple of weeks. Now, yesterday, it's doing the same thing again. Anyone have an idea of the most likely problem? I don't believe it's low refrigerant or any other major component failure, probably a faulty switch or sensor or something. There is no check engine light or anything. I assume there probably is a code that could be read even though the check engine light is not on. Thanks for any feedback. The AC system has not been touched by anyone since the car was new. Also, the car has the manual climate control.

Update: After writing this question, I went out to the garage and checked the car now that it's been sitting for 17 hours and the AC is working perfectly. This problem seems to come up when the car is hot and it's been sitting out in the very hot sun for a few hours. Not nice to get in a hot car on a 95 degree day and have no AC. Obviously it's some little thing causing this problem, but figuring it out may be tough!

mk378 on Wed July 04, 2012 5:51 PM User is offline

Check the clutch gap. It may have just been coincidence about disconnecting the battery.

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