I just bought a daily driver, '90 LS teg. I was sitting in it the other day and decided to run the a/c since it was hot. Well as i sit there and it runs it blows nice and cold...i then went to drive off and as soon as the rpm's hit 2-3,000 the belt started sqeeking like crazy but then stopped after about 5 sec. At this point the a/c starts to play games. Some times it will continue to blow cold and other times it won't. As soon as i stop though the a/c blows cold everytime or if i throw it in nuetral while going it will blow cold. What do you guys think it is? You think it could be the belt is old and i need a new one and that is causing it to slip after it hits 2-3,000 rpm's? Any help would be greatly appreciated. Thanks

 

I would start by replacing the belt. If that doesn't do the trick then trouble shoot from there.