88red4cyl Posted July 30, 2008 Report Share Posted July 30, 2008 First off, the reason I'm asking this is because the wife and I are going out of town for the weekend. I have decided that I just can't catch a break as far as these cars go... First there's the bad mileage on the 99, then the mounts went bad on the 95, then the 99 developed a massive vacuum leak.. And today I noticed a vacuum leak on my 95.. Bein the sleuth that I am , I decided to investigate on my lunch break today.. So I'm under the hood (holding it up with my head because my hood strut is blown, btw), and I'm revving the motor with the throttle cable to see if I can hear where the vac leak is coming from.. SO I rev the motor, and when I let off, I hear a clunk as the motor slows back to idle.. It sounded and felt like it came from inside the motor, and it was just one clunk.. So, I revved it again, and same thing happened, one single clunk when the rpms slowed down.. So I turned off the a/c (I always have it or defrost on because the compressor makes an awful noise when it's not turned on) so I could hear the clunk better.. All of a sudden, it's not doing it anymore.. So I turn the a/c back on, and it's doing the clunk again.. Is that the clutch on the a/c compressor kicking on/off, or is something screwy somewhere else... I still haven't gotten the mounts fixed (doing it tomorrow, if it doesn't rain), so maybe it has something to do with that? Thanks in advance for your help, I honestly appreciate it.. Quote Link to comment Share on other sites More sharing options...
slick Posted July 30, 2008 Report Share Posted July 30, 2008 The clutch *should* disengage when over a certain load amount, and then re-engage after getting back below that load amount. Take a piece of hose and put it to your ear, and the other end down at the compressor next time. Quote Link to comment Share on other sites More sharing options...
88red4cyl Posted July 31, 2008 Author Report Share Posted July 31, 2008 The clutch *should* disengage when over a certain load amount, and then re-engage after getting back below that load amount. Take a piece of hose and put it to your ear, and the other end down at the compressor next time. Thank ya! If it is my compressor, then it must be on it's way out... It's almost like a single knock when it happens, and the belts slow down... Hm... And I've also noticed that if the compressor isn't engaged, it makes a loud sound from the belt area, not really a squealing, just an annoying noise.. Quote Link to comment Share on other sites More sharing options...
rockfangd Posted July 31, 2008 Report Share Posted July 31, 2008 most of the compressors have bad clutch problems, they make even a really nice gm sound like complete shit because of them lol. Gottta love GM Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted August 1, 2008 Report Share Posted August 1, 2008 I dunno if it's on its way out or not, but I can say that I've had several GM cars where the compressor sure sounded like it was more than ready to die, but it never had any trouble other than horrible noises. Heck, the one on my GTO made this really loud snap, followed by what sounded like a fan grinding up against a shroud for about 20 seconds. This would happen every time I turned it on, and the thing was almost brand new! Always blew cold though, and I stopped worrying about it when everyone else said that theirs did the same thing Quote Link to comment Share on other sites More sharing options...
Zanix Posted August 27, 2008 Report Share Posted August 27, 2008 I dunno if it's on its way out or not, but I can say that I've had several GM cars where the compressor sure sounded like it was more than ready to die, but it never had any trouble other than horrible noises. Heck, the one on my GTO made this really loud snap, followed by what sounded like a fan grinding up against a shroud for about 20 seconds. This would happen every time I turned it on, and the thing was almost brand new! Always blew cold though, and I stopped worrying about it when everyone else said that theirs did the same thing I was just about to make a thread about this. I hate to be redundant, but I'm a little worried. I might anyway for my nerves sake. You know, talk it out so I can sleep tight. Quote Link to comment Share on other sites More sharing options...
88red4cyl Posted August 27, 2008 Author Report Share Posted August 27, 2008 I dunno if it's on its way out or not, but I can say that I've had several GM cars where the compressor sure sounded like it was more than ready to die, but it never had any trouble other than horrible noises. Heck, the one on my GTO made this really loud snap, followed by what sounded like a fan grinding up against a shroud for about 20 seconds. This would happen every time I turned it on, and the thing was almost brand new! Always blew cold though, and I stopped worrying about it when everyone else said that theirs did the same thing I was just about to make a thread about this. I hate to be redundant, but I'm a little worried. I might anyway for my nerves sake. You know, talk it out so I can sleep tight. I wouldn't worry about it.. I've driven the car almost 2k miles since I made this thread, and it hasn't changed at all (i.e. gotten worse)... It still does the clunk when the ac is on, and still doesn't do it when off.. My compressors are noisier than hell on both the 95 and the LTZ, so I have just learned to ignore the noises by now.. Well, the compressor and the bearings on my alternator, but that's another story... Quote Link to comment Share on other sites More sharing options...
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