Mystery noise from under the hood

**Zaskar** · 05-05-2014, 11:06 PM

My T5 crewvan has started making a strange buzzing or humming noise. Its getting more frequent, however i cant find a commonality. My best guess guess is a noisy power steering fluid pump (if there is such a thing).

It happens with or without air con, so its not that fan. It only lasts 0.5-1.0 seconds so i cant record it.

The van's still under warranty, but I'm pretty sure 'funny noises' aren't covered.

Does anyone have any suggestions?

IN2VWS · 06-05-2014, 06:21 AM

When does it happen? When you are turning? Driving at speed in a straight line?

**Zaskar** · 06-05-2014, 09:12 PM

Originally Posted by IN2VWS

When does it happen? When you are turning? Driving at speed in a straight line?

I haven't been able to discern a commonality. Its seems to happen at random times, although more frequently lately.

**yt5** · 07-05-2014, 06:14 AM

does it sound like a cow mooooooo! if so it counld be the n57 valve

**Zaskar** · 07-05-2014, 07:29 AM

yeah it is a little cow like
Ohhh of course the N57 valve... (whats that)

Originally Posted by yt5

does it sound like a cow mooooooo! if so it counld be the n57 valve

**REVHE4D** · 08-05-2014, 12:06 PM

I started to get this intermittent Moo/humming/vibration sound myself as of the last service, soon as I take my foot off the gas it goes away. And I only hear it every other day on and off. I did have a problem 2 years ago with my new n57 valve that was replaced under warranty due to my vw humming when the engine was turned off, and losing boost at low revs. Do you guys think it's the same valve?
If so my vw is just out of warranty what are our options?

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**greymad** · 19-05-2014, 03:45 PM

So what, please, is the "n57 valve" - or is it a state secret...

**brad** · 19-05-2014, 04:10 PM

boost control valve was the first hit when I googled it

**greymad** · 20-05-2014, 05:41 PM

Originally Posted by brad

boost control valve was the first hit when I googled it

OK - thanks for that ... my buzzing noise generally seems to occur when I back off the throttle, even after quite gentle acceleration.
It's driving me nuts.

**Robear** · 20-05-2014, 10:22 PM

Originally Posted by greymad

OK - thanks for that ... my buzzing noise generally seems to occur when I back off the throttle, even after quite gentle acceleration.
It's driving me nuts.

does it sound like this? I captured it with my dashcam http://youtu.be/PXl99edCTB8

If so we are in the same boat I posted about it yesterday...