Curious noise

Micky 32 · 27-04-2008, 02:31

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.

Taxi 219 · 27-04-2008, 03:31

Maybe cooling fan still running???

Makefish · 27-04-2008, 05:26

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.

Tomo1971 · 27-04-2008, 09:44

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

Micky 32 · 27-04-2008, 11:37

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.

dstev2000 · 27-04-2008, 11:47

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.

mrx · 27-04-2008, 12:04

Quote:

Originally Posted by Micky 32

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.

Micky 32 · 27-04-2008, 12:05

Quote:

Originally Posted by dstev2000

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.

dstev2000 · 27-04-2008, 12:08

Quote:

Originally Posted by Micky 32

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.

Micky 32 · 27-04-2008, 12:10

Quote:

Originally Posted by dstev2000

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.

dstev2000 · 27-04-2008, 12:14

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

My two cars are oil burners so might not apply

flynntech · 27-04-2008, 20:38

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

dan_the_v8man · 27-04-2008, 21:11

didnt think the turbo was water cooled?

Micky 32 · 27-04-2008, 23:19

Quote:

Originally Posted by flynntech

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

You could be right

, 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

mrx · 28-04-2008, 03:40

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...

27-04-2008, 02:31	#1
Micky 32 Briskodian Join Date: Nov 2005 Location: Longford, Ireland Posts: 348 Thanks: 8 Thanked 5 Times in 5 Posts	Curious noise 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. __________________ 2008 Race blue 2.0 TFSI vRS, xenons, jumbo box, dual zone, rear electric windows, maxidot, rain sensing wipers and dimming mirror, light assist, rear parking sensors, cruise control, ESP, Miltek catback, and anti wet ars!e feature....

27-04-2008, 03:31	#2
Taxi 219 Get out the way Join Date: Oct 2007 Location: Bournemouth Posts: 1,783 Thanks: 53 Thanked 73 Times in 70 Posts	Re: Curious noise Maybe cooling fan still running??? __________________ Car now: 56 Octavia MK2 1.9TDi Ambiente Previous: 06 Octavia Mk1 1.9TDi Classic with + pack Sadly missed: 97 Nissan Primera 2.0TDi SLX

27-04-2008, 05:26	#3
Makefish Ex-Moddy Join Date: Jul 2005 Location: Hampshire Posts: 7,950 Thanks: 148 Thanked 227 Times in 168 Posts	Re: Curious noise 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. __________________ Black magic Octy II vRS MY2008 with Maxidot ~ Xenons ~ Cruise ~ Light Assist ~ Dual Zone Climate Control ~ Rain Sensing Wipers ~ MFD2 Satellite Navigation ~ VAG Bluetooth Phone Kit ~ Milltek Exhaust with 2.75" Downpipe ~ EVOM Ram Air Intake ~ Nuespeed Shortshifter ~ Eibach Rear ARB ~ Koni FSD Dampers ~ Eibach Springs ~ Forge Front Mounted Twintercooler ~ Nuespeed Hi-Flo Intercooler Pipe ~ Nuespeed Hi-Flo Turbo Outlet Pipe ~ Eurojet PCV Valve ~ Forge DV ~Autotech Hi Volume Fuel Pump ~ Nuespeed Torque Arm Insert ~ NGK Iridium Spark plugs ~ REVO Stage II+ Software ~ Matt Black Viper Stripes!

27-04-2008, 09:44	#4
Tomo1971 Briskodian Join Date: Jan 2008 Location: Fife, Scotland Posts: 486 Thanks: 11 Thanked 25 Times in 24 Posts	Re: Curious noise 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 __________________ Brilliant Silver vRS TDi Hatch,Maxidot,Light Assist,Cruise,Park Assist, Jumbo Pack,OEM Bluetooth Kit, Vag-Com Micro-Can.

27-04-2008, 11:37	#5
Micky 32 Briskodian Join Date: Nov 2005 Location: Longford, Ireland Posts: 348 Thanks: 8 Thanked 5 Times in 5 Posts	Re: Curious noise 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. __________________ 2008 Race blue 2.0 TFSI vRS, xenons, jumbo box, dual zone, rear electric windows, maxidot, rain sensing wipers and dimming mirror, light assist, rear parking sensors, cruise control, ESP, Miltek catback, and anti wet ars!e feature....

27-04-2008, 11:47	#6
dstev2000 Briskodian Join Date: Aug 2005 Location: All over the place Posts: 3,825 Thanks: 37 Thanked 150 Times in 136 Posts	Re: Curious noise 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. __________________ MY08 L&K: Black-Estate-Diesel-Sunset Glass-MFD2-W8 Interior light-Colour coded door strips-LED sidelights and Puddle lights-VAG-COM fettled-Lovely! SWMBO's: MY08 vRS TDI - Standard

27-04-2008, 12:14	#11
dstev2000 Briskodian Join Date: Aug 2005 Location: All over the place Posts: 3,825 Thanks: 37 Thanked 150 Times in 136 Posts	Re: Curious noise Note to self, read sig for OP's engine type My two cars are oil burners so might not apply __________________ MY08 L&K: Black-Estate-Diesel-Sunset Glass-MFD2-W8 Interior light-Colour coded door strips-LED sidelights and Puddle lights-VAG-COM fettled-Lovely! SWMBO's: MY08 vRS TDI - Standard

27-04-2008, 20:38	#12
flynntech Briskodian Join Date: May 2005 Location: Eire Posts: 386 Thanks: 4 Thanked 3 Times in 3 Posts	Re: Curious noise Its a mini water pump for the turbo to cool it. __________________ VAGdrivers.net - Ireland's online VAG community

27-04-2008, 21:11	#13
dan_the_v8man Briskodian Join Date: Mar 2008 Location: Sheffield Posts: 308 Thanks: 12 Thanked 8 Times in 8 Posts	Re: Curious noise didnt think the turbo was water cooled? __________________ 57 Mk2 2.0TFSI vRS Estate in Race Blue, jumbo box, cruise control, dual zone climate, zenith 18", maxidot, xenon's, rear parking sensors, light assistance, sunset glass

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