After i have gone for a run in my new vRS and get out and lock the car, from under the bonnet you can hear a slight humming noise for a while like a whirring sound. If you're looking at the front of the car it seems to be coming from below on the left.

Maybe cooling fan still running???

That's what it sounds like to me too, coolings fans do stay on for a bit longer especially if you've just been for a bit of a blast. Nothing to be worried about imo.

and as a side note, as with any turbo car let the engine idle for a few moments after a run before switching off. This allows the turbine to stop before you starve it of oil.

Likewise when you set out, keep the revs low for a while so that oil can circulate round the engine.

Steve

Definately not the fans. It seems to be coming from low down on the left and it's a very faint high pitched hum. I do have a theory that like the old VW turbo diesels they had a small electric pump that circulated coolant around for a few minutes after a run when the engine was switched off.

I've heard it too, goes off after 3 or 4 minutes with a click.

I concur it's not the fans, the noise appears if you turn the ignition on and off again. It's common to 140 and 170 variants.

It's a high frequency humming noise similar to xenons when they first start up. I thought it was more from the front of the engine when I tried to trace it.

Definately not the fans. It seems to be coming from low down on the left and it's a very faint high pitched hum. I do have a theory that like the old VW turbo diesels they had a small electric pump that circulated coolant around for a few minutes after a run when the engine was switched off.

The 2.0 TFSI engine does have an auxillary coolant pump that keeps coolant flowing for a few minutes after you turn the engine off.

I've heard it too, goes off after 3 or 4 minutes with a click.

I concur it's not the fans, the noise appears if you turn the ignition on and off again. It's common to 140 and 170 variants.

It's a high frequency humming noise similar to xenons when they first start up. I thought it was more from the front of the engine when I tried to trace it.

I have found there are 2 noises. When you turn off there is a loud hum( not fans) that goes off with a click after 10 seconds. Then you hear the faint one down low on the left, seems to stay on a while.

I have found there are 2 noises. When you turn off there is a loud hum( not fans) that goes off with a click after 10 seconds. Then you hear the faint one down low on the left, seems to stay on a while.

I'll have to have a look for that one. I've only ever heard the louder one of the two, it does stay on much longer if you turn on the ignition without starting the engine.

I'll have to have a look for that one. I've only ever heard the louder one of the two, it does stay on much longer if you turn on the ignition without starting the engine.

This is on a TFSI. The TDI may be different. After a run put your head around the front left foglight and it can be heard.

*Note to self, read sig for OP's engine type*

My two cars are oil burners so might not apply

Its a mini water pump for the turbo to cool it.

didnt think the turbo was water cooled?

Its a mini water pump for the turbo to cool it.

You could be right:thumbup:, was listening earlier and it does seem to come from that area. Must be one of the reasons it has a big battery and a 140 amp alternator:eek:

As per my previous post (post #7 above), the turbo does have water galleries in it, and there is an auxillary cooling pump that operates after engine shut down.

The attached document explains it with pretty pictures...