I have a 2006 A4 with 107K miles. It recently started making a whistling noise after it has warmed up. It only makes the noise when it is at idle or decelerating. It whistles both in park and neutral. It sounds like a bad bearing to me, but it continues for a few seconds after the motor has stopped. I cant tell exactly where the sound is coming from but it appears to be loudest between the firewall and motor.

This is my first Audi, and I dont want it to be the first time I have to take one of my cars to a mechanic to diagnose a problem, but I am stumped.

Thanks for any advise!

 

what motor?

first guess is auxiliary coolant pump

good luck

 

Sorry, I missed a key piece of info. It is the 2.0t

What would cause the secondary coolant pump to continue to whistle after the engine has stopped?

 

I answered my own question with regards to the Aux pump myself.

 

Someone on the forum reported some whistle sound like that at low rpm and just after shutdown, and it turned out that the PCV valve was plugged and not functioning correctly. Wonder if that could be the issue.

 

Thank B7. I replaced the PCV this evening, and it appears to have fixed the problem.

 

I have exactly the same problem, it was a 3 second whistle in the beginning, but now I am having this trouble every time that the engined warmed up...any solution or suggestion?

 

yeah that stock PCV is a POS. i ignored the whistle at idle for 20k km and i finally took it to the dealership and it was the POS PCV. she ran like new after i got the most recent PCV installed.

 

sorry my stupid question but i could not find that part on the engine...where is it located?

 

The PCV is under the plastic engine cover (where 2.0FSI turbo, and Audi rings are). Pull it straight up and you will see the PCV under it. It is black, round and has a plastic tube connected to it. Mine went at 24tmls. The only symptom my car had was oil being pushed out around the oil filler cap.