ceroberts75

The last couple of weeks, I have started getting a whistling as the engine gets warmer and when it is cold, it is a low tone

Just wondering if anyone has had this happen and where I should start looking for the noise.

When I inspect, sounds like it is coming from the back of engine compartment

03_AR_CO

If it is toward the back of the engine it could be this:

http://www.ebay.com/itm/Audi-vw-4-2L-00-09-Crankcase-Vent-Valve-VAICO-pcv-crank-case-ventilation-/231313737855?_trksid=p2054897.l5658
I am not endorsing this seller, was just the 1st example I found. When mine was going bad made a noticeable sucking wind/whistling noise.

By the way do not go with after market on this, you may save a few $'s initially, but you will likely be changing it out again after 6 months or less.

ceroberts75

thank you for the reply, sorry took so long to get back.

yup...that part was doing it, along with the vaccuum hose going under it.

funny, i replaced that part first, as the seal inside of it was cracked 1/4 of the circumference. The audi part i repaced it with, worked fine for the first 30 minutes...then when i drove, it sounded like i had a flapping goose everytime i gave the engine gas! lol.

defective first part, replaced again and fine.

still had a whistle, with some smoke testing, it was the other end of the vaccuum hose that goes behind the engine between the firewall.

couple hours of labor and $89 hose.

should have it back this afternoon.

thanks again. HHHOOOOONK! lol.