01 silverado AC quit

[MNice]

I checked the relay & fuse in the elec box under the hood, both OK, I don't think it's low on freon, blew very cold air since new, even up to last week when it was about 500* out. I assume there is another relay or fuse to engage the clutch, but have not looked into it real deep yet.

any ideas??

thank you!!!!

[spearchucker]

There are low and high pressure switches that can go bad. They will keep the compressor from kicking on.

[Jeremy airjer W]

The first thing you do when checking an a/c issue is hook up the gauges. Leaks can happen at any time or over time. if the system is low/empty the compressor will not engage.

The Lakeville Paramount Goodyear has A/C performance checks for $29.95 plus freon this week. Its a little ways from you but not to bad. If you interested you can click the weekly special link in my signature.

[Esox_Magnum]

Theres a little thing on the side of the canister, wiggle it and see if the comp kicks in, mine was bad and even after telling the shop this they still claimed I was low on freon, I knew I wasn't we charged it when it started acting up ourselves. After a $190 charge for " fixing it" it didnt work in the parking lot when I picked it up. Of course after hours but they got an earfull next morning and the part I said was bad and they said was fine was replaced on their dime and been working perfect since.

[ottertailguy]

I had an 95 Chevy that the air quit one day also. I asked a friend and he told me unless there was alot of noise when the cold air flow stopped it probably is not the compressor. He told me to try bypassing the high pressure switch. I just unhook the wire harness and took a paper clip and inserted one to each hole. It's been awhile so I don't remember if I put the paper clip in the wire harness or the high pressure switch. I think it was the harness because that would be bypassing the high pressure switch. When I did the compressor came on after I started the engine. Just unscrew the switch and only a very little comes out and than it seals back up. Than the new one can be installed. Good luck.

[MNice]

Well, its fixed, however, I feel pretty dumb. It was the belt. I had my first chance to take a good look at it last night. The compressor is way down at the bottom and herd to see, but I did figure if the belt was gone, the compressor more than likely wouldn't work. Not the most pleasant to change out, tensioner is good, compressor is good, nice cold air is great!!

[jeffreyd]

why did the belt go? do you have something else that is locked or locking up the wipe the belt off? i know the idler pulleyswould lock up or build a bunch of old belt wear on the pulley making it unstable for a new belt to ride on.

[Jeremy airjer W]

That's funny! I didn't even think about the separate belt for the compressor.

Jeffery, the belt went because nobody replaces them when they need to be. Fairly common to see them with the belt missing.

[MNice]

Airjer, you hit the nail on the head. I've got 195,000 and still was the original. I have replace the main serp and keep the old one as a spare.