my audi a4 b5 AEB brick 99 . when i turn the ac on and push the gas its fine just ac squeeks idk why but when i relese the gas my car drops into the dangerous 300 rpm range and almost stalls out. then bouncecs to 500. when ac is off this dosnt happen how can i fix this??? any help please also my car is the 5 speed 1.8t

I have the same issue as well!!! My car stalls when my AC is on sometimes! Solutions?

mine raises when i turn the a/c on. How tight is the belt? Also check for vaccum leaks.

It's worth doing a throttle adaptation as well (search feature will reveal how). Over time your throttle can lose alignment and you may be a little low, enough that the increased load on the engine from the AC causes it to bog.

will do a throttle adaptation....and get back to you.....

Also could be vacuum leaks. It's worth doing a test for them, especially if your car still has 11+ year-old rubber hoses.

how do i do a throtle adaption?? whaaa...and my previous owner installed some aluminum thing i think its a bancy blow off valve comes from the intake vacume line that originaly had 2 hoses now has a screw and one hose going to the blow off valve ... i highley doubt it is anything to do with vacumes...but how can i do a throttle adaption

well nevermind google answered it haha thank you for the answers tho guys big help=)

ok so on google all i found was that u have to have vag com but some people said some little trick i purchased a kkl hong cong stupid vag com cable that im sure wont work when it gets here 7$ down the toilet so can someone tell be the secret trick to make it do its own throttle body adjustment

turn the key without starting the car and let it sit. you'll hear some noise under the hood.