High pitched squeal

[sixfootchoc]

As of this afternoon, my 08 GTI DSG has started making an odd noise (i normally hate these sorts of vague posts). With the engine warm, If you come off the throttle and the car coasts, there is a high pitched squeal coming from the engine bay. It hasn't lost any boost pressure, there is no problem with the gears as it changes up or down, but as soon as you come off the throttle, it squeals for a good 3 -4 seconds, then quietens down. It sounds vaguely like a noisy waterpump.

The aircon is off, I've even slipped it into neutral while rolling and the sound persists.

No lights showing up on the dash, everything else is normal.



Any ideas?

Cheers


Fortunately it's still under warranty and the sound is consistent.

[Golf Houso]

Acessory belt tensioner? My VR6 used to squeal like a stuck pig when the car was cold, or at high RPM shifts every once in a while until I changed the acessory belt tensioner assembly.

[NabzGTI]

Check that your diverter valve is tightly bolted on.. could have a miniscule air leak.

[adzy]

Also, make sure that you check under the car and between the engine and firewall for small children.

[sixfootchoc]

Car is going in for interval service, checked with mech, it's the breather valve. Replacement part on order.