Strange vacuum cleaner noise when cold outside

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   Good morning all   

Bit of a strange one , now the mornings are getting cold 7 degrees here I have noticed if I rev my car even stationary after a 5 min warm up I can hear a noise Luke a quiet vacuum cleaner. The noise goes away when the car is warm. The turbo pulls like it should and no extra smoke etc.

I'm just wondering if this is like a built in technology to by pass the turbo when starting from cold or a secondary air injection set up etc ? 

When starting the car on a warm day I don't get it , have heard it a couple of random cold days.

The noise isn't a high pitched siren etc more like there is a small quiet vacuum cleaner.

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Bgmick Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 23 Jun 2018 Location: Scotland Status: Offline Points: 80	Post Options Post Reply Quote Bgmick Report Post Thanks(0) Quote Reply Topic: Strange vacuum cleaner noise when cold outside Posted: 30 Aug 2018 at 7:24am
	Good morning all Bit of a strange one , now the mornings are getting cold 7 degrees here I have noticed if I rev my car even stationary after a 5 min warm up I can hear a noise Luke a quiet vacuum cleaner. The noise goes away when the car is warm. The turbo pulls like it should and no extra smoke etc. I'm just wondering if this is like a built in technology to by pass the turbo when starting from cold or a secondary air injection set up etc ? When starting the car on a warm day I don't get it , have heard it a couple of random cold days. The noise isn't a high pitched siren etc more like there is a small quiet vacuum cleaner.

Bgmick Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 23 Jun 2018 Location: Scotland Status: Offline Points: 80	Post Options Post Reply Quote Bgmick Report Post Thanks(0) Quote Reply Posted: 30 Aug 2018 at 7:29am
	Car runs great no roughness or increased fuel consumption

Bgmick Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 23 Jun 2018 Location: Scotland Status: Offline Points: 80	Post Options Post Reply Quote Bgmick Report Post Thanks(0) Quote Reply Posted: 30 Aug 2018 at 6:17pm
	Should clarify it's not a sucking sound it's like the motor sound a vacuum makes

chrisw99 Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 16 Jan 2013 Location: Cheshire Status: Offline Points: 960	Post Options Post Reply Quote chrisw99 Report Post Thanks(0) Quote Reply Posted: 31 Aug 2018 at 9:12am
	Try eliminating some things. When it's doing it, turn off completely the AC and climate systems, that will rule out the compressor motor, the fans, etc. If the noise does stop, it's something related to that.
	QQ3: 2014 1.2 dig-T ntec+ gunmetal grey QQ2: 2013 CVT 360 silver QQ1: 2009 1.5dci n-tec fired iron

pandjh Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 17 Mar 2010 Location: South-East Status: Offline Points: 530	Post Options Post Reply Quote pandjh Report Post Thanks(0) Quote Reply Posted: 31 Aug 2018 at 12:13pm
	Wiper fluid pump stuck on? LED headlight bulb fans? Edited by pandjh - 31 Aug 2018 at 12:15pm
	2015 QQ 1.2 Dig-T N-Tec+, Black Previously 2009 QQ 1.5dCi Acenta, Black

Bgmick Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 23 Jun 2018 Location: Scotland Status: Offline Points: 80	Post Options Post Reply Quote Bgmick Report Post Thanks(0) Quote Reply Posted: 01 Sep 2018 at 5:33pm
	Nah windscreen pump all good , don't have any led headlamps and turning aircon off and fans doesn't change it. Was just hoping someone would have said they all do it to a degree and it's some kind of noise due to some fancy thermal dynamics type thing to speed up warming the engine Still hoping lol to be fair I wouldn't have even noticed if I hadn't had the stereo off

chrisw99 Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 16 Jan 2013 Location: Cheshire Status: Offline Points: 960	Post Options Post Reply Quote chrisw99 Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 9:42am
	Is the noise loud enough to record on a quick video you could post here then we can have a listen?
	QQ3: 2014 1.2 dig-T ntec+ gunmetal grey QQ2: 2013 CVT 360 silver QQ1: 2009 1.5dci n-tec fired iron

Bgmick Members Profile Send Private Message Find Members Posts Add to Buddy List Tekna Joined: 23 Jun 2018 Location: Scotland Status: Offline Points: 80	Post Options Post Reply Quote Bgmick Report Post Thanks(0) Quote Reply Posted: 03 Sep 2018 at 10:47am
	Unfortunately not a microphone won't pic it up I'd imagine anybody else driving it wouldn't notice ...... I only heard it with stereo being off one morning but now can't stop listening for it lol