http://www.peachparts.com/shopforum/forumdisplay.php?f=14
For good mechanics
1. You might be overheating, having some problems with your cooling system. Also you could have vacuum or fuel hose leak some where. It could be many things, more specific info is needed.
2. It could be you ac compressor clutch.
Does it work when your at a stop or when your driving? More info is needed.