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Mine’s a p300, did it to me as well. It might not be a bad thing in reality. Yes, use a little more fuel but probably helps the compressor when it’s hot outside to help keep you cool.
@ Phil, I consider it high idling only because when I put it in D or R the RPM's drop to about 650ish, which I consider normal.
Most cars, at least those that I’ve owned in my past 40+ years have a similar feature. Activating the AC bumps up the engine RPMs either by engine control electronics, or in older more primitive vehicles, switching on some type of solenoid which opens the throttle body wider to increase engine speed. Without that, the extra load placed on the engine when the compressor clutch engages would do just the opposite and bring the RPMs down. I had first hand experience with this years ago when a vehicle I owned, and was carbureted, would drop RPMs to a near stall when the AC was turned on. There was a small solenoid type actuator that would extend a small piston-like arm which would push on the throttle arm on the carb when the AC was called for. That device had failed, resulting in the RPM drop. Replacing it brought the RPMs up several hundred when using the AC.
