Why does my 1998 Ford Mustang GT idle weird when I put the ac on?

C

C S

New member
The engine runs fine without it - idles at about 1k rpm, but when I turn on the ac the rpm's surge up to about 1.5k, then back down to 1k. It does this the entire time the ac is on. I've only had the car for two weeks and its been doing it ever since. Any advice? Thanks.
 
because when you turn on the A/C the Pump locks in a Clutch inside the pump and it puts a load on the motor so the Motor computer has to make a quick change to keep it self running in turn jacking up the motor rpm temporaly. nothing to wory about
 
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