Weird AC/RPM Problem

[BurnBarfield]

As summer has recently arrived, the use of my A/C has become much more usual.

Lately though, I have a weird problem where when my A/C is on, the RPMs stay up a second or two longer after I depress the clutch. Though when A/C is off, everything functions normally. Any idea what this could be?

 

[smores114]

The AC compressor will cause ## motor to rev higher.

Its nothing to really be worried about. my 95 TSI does the same thing at idle and also my friends mr2.

 

[TSi Fury]

Your AC is belt driven off the motor, so when the A/C is on that's just a little bit more for the motor to turn, so your car will in turn idle just a little bit differently.

 

[TSi Fury]

Also, just thought I'd add.. when my A/C was on, it also affected my alternator a little bit... It was just barely noticeable, but you could pick up the difference on my digital voltmeter.