I recently started hearing a high pitched whining that goes with the gas and the gear shifts only when the A/C is on. when it is off it goes away. Someone told me its a grounding issue but sounds like bs

some one chime in. thankss!

 

Check your belts before anything else!

 

already tightened my belts but its not that type of whining. i can only hear it from inside the car it seems

 

anyone??? 04 5AT

 

i get this from time to time as well. GOing back a few years people were calling it the ghost turbo for our cars. It can get annoying i just ignore it now and still have no idea why its there lol .

 

Mine does this too

 

i usually have my music up so it doesnt bother me but it is annoying when i need quiet with the windows up

 

mouse is living in the heat exchanger..

 

i believe it is the ac compressor bearing mine does the same thing.

 

That, or the idler pulley. You can use a long screwdriver as a probe, to pinpoint bad bearings. Put the screwdriver point on the compressor closest to the pulley, and the handle against your ear while the car is running. Same thing for the idler, but you can use the fixed bolt in the center up front.

Check each one, even if you think you've found the one with the distinct sound. If it's loud enough to hear in the car, it should stand out.

Disclaimer:
Don't be "that guy" who has long hair or loose clothing, bring common sense when doing this.