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A/C belt noises progressed to hissing and now no A/C
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Question
JimiMc
Hello, I've got an issue with my a/c on my 2001 GMC Sierra.
Last summer, 2013, I lost my original a/c belt. After replacing the belt, I had a strange periodic noise that sounded like the belt was slipping or flapping while first starting out it 1st gear to 2nd gear. It would then sometime make a little noise at speed, but not always. I figured it was just a crappy aftermarket belt that slipped and continued to drive with it. That replacement belt lasted just about a year. So I replaced it again. The new belt made the exact same noise.
After installing the new belt and having to deal with the noise again, I decided to leave it and planned on replacing it again next year if and when it broke. The A/C worked fine.
Just the other day, (about a month after replacing the belt) I was driving and could hear an odd noise while driving. I lowered my window and could not hear it with the wind noise, so I figured it was an outside noise not related to my truck. I arrived at my destination about 2 minutes later. While walking into the store, I could hear a hissing noise coming from the front end. It sounded as if a tire was leaking from a nail or something. But it was not the tires. I raised the hood and could hear it coming from down near the compressor. The was a very noxious odor rising up from there. I started the engine and could see vapor or smoke getting blown around by the fan. It eventually stopped and now my A/C does not blow cold any longer.
After driving the truck back home, I crawled around trying to isolate the trouble so I could order whatever part I needed. I detected no obvious spots on the lines, and the pully/clutch on the compressor spins freely. I then noticed a wire haging loose near the rear of the compressor. A purple plug was attached that looked as if it had melted or been chewed up or something. No idea how that could have occurred. After searching the net, it appears to be the high pressure switch. I could buy a new one, but I don't think it would be able to seat properly due to the remnants of the old one still stuck in the compressor.
Could the noises have been the compressor going bad, then eventually blowing the high pressure switch out of it? If so, would it leak out? Kind of stuck on what to do. Any help would be appreciated.
Jimi
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