Idling problems

Believe it or not that is what is is supposed to do. You must have a manual transmission and because of that the rise in idle speed is more noticeable. The reason for the raising of the idle is to compensate for the extra load on the motor that the AC compressor adds. It takes a few horsepower to turn that compressor and if the idle were not raised the engine could stall when the compressor kicks on. Remember the compressor is also on when the defroster is on. I hope that helps you out.