Mystery noise from under the hood

[Zaskar]

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]

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

[Zaskar]

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]

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

[Zaskar]

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

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

[REVHE4D]

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]

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

[brad]

boost control valve was the first hit when I googled it

[Robear]

Now this is a weird one. It's something that happens intermittently so difficult to show the service guys on a test ride. Sometimes it can happen 3 or 4 times in 10 minutes, then sometimes not for 20 minutes at all...I have attached a Youtube link here from my dash cam, but for those who cant get there, its a mechanical noise that sounds like an electric aerial winding down, but only for a second, sometimes longer.

Can someone shed some light on what it could be? Its a Multivan Edition 25, I have turned off the heater, the radio, but have no idea what it may be, any suggestions would be lifesaving as its driving me insane...

http://youtu.be/PXl99edCTB8

Thanks in advance

[REVHE4D]

That is the same noise my t5 is making since my last service, and my warranty has just run out. This is starting to sound like a common problem. There is a thread here about intermittent buzzing regarding similar users.
Does anyone know if i can get this covered under warranty even though it has just run out?
This is sad to see so many of us with this issue.
As others have suggested it most likely is the boost release valve. It seems to be faulty.

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