I also have this problem.
Everytime I turn on my AC the Rpms will jump up from 700 to 1500.
Then I turn it off and its fine...
I think it has something to do with my cold air intake..I just installed it a couple of weeks ago.
Before I dont remember having this problem but then again it might not have anything to do with it.

I'll appreciate any info.

 

a cai would not do that!

 

Mine has done it for about 2 years now, even before I had CAI.
Its probably just the 4 banger trying to keep up.

 

dude!! valdosta? i used to live waaaaaay down there, worked at moody, dropped outta vsu, went to lowndes. god i feel for you. i mean, it could be cool for you i guess, if you're a good ol' boy.
anyhow - the extra strain caused by the AC causes the rpm to jump, i think controlled by the IACV. it may be more noticable with the intake, too. it's a good thing, because now you won't stall out when the air comes on. when my IACV went bad, my car would stall if i was at idle speed witht he AC on.

 

Thanks for the help so far.
I'm not too good with the terms but what does IACV mean (Jagan'92)

 

sorry idle air control valve. basically what controls the amount of air your car takes in while idling - which will need to be higher when your AC kicks on, right?