Buy all your VW California Accessories at the Club Shop Visit Shop


Whirring Noise

E

elevan

VIP Member
Messages
7
I'm getting a weird whirring noise, in short bursts, from under the bonnet. Mostly when driving quite slowly on winding or undulating country lanes and sometimes when taking my foot off the accelerator. Also immediately after stopping and switching off. It sounds like some sort of pump.
Any ideas?
 
Meoncoast

Meoncoast

an Ocean by the Sea
Top Poster
VIP Member
Lifetime VIP Member
Messages
4,260
Location
Moorgreen
Vehicle
T6 Ocean 150
What are you driving? may help
 
Alan Andrews

Alan Andrews

Lifetime VIP Member
Messages
698
Location
Staffordshire
Vehicle
T6 Ocean 150
I'm getting a weird whirring noise, in short bursts, from under the bonnet. Mostly when driving quite slowly on winding or undulating country lanes and sometimes when taking my foot off the accelerator. Also immediately after stopping and switching off. It sounds like some sort of pump.
Any ideas?
Might help if you can record the noise please.
 
E

elevan

VIP Member
Messages
7
Not sure if I can record it. It's intermittent and on good roads doesn't happen at all.
 
Meoncoast

Meoncoast

an Ocean by the Sea
Top Poster
VIP Member
Lifetime VIP Member
Messages
4,260
Location
Moorgreen
Vehicle
T6 Ocean 150
N75 Moo valve ? around 2012 issue on 180s updated pipes and valves fix the issue on our 2012 180 SE could be that.
 
E

elevan

VIP Member
Messages
7
N75 Moo valve ? around 2012 issue on 180s updated pipes and valves fix the issue on our 2012 180 SE could be that.
N75 Moo valve ? around 2012 issue on 180s updated pipes and valves fix the issue on our 2012 180 SE could be that.
Moo valve sounds very likely. Have since found it elsewhere in the forum including a recording which is the noise I have. Never heard of a moo valve before today and now know why it is called thus. Very many thanks for your advice.
Good night.
 
Elmo3

Elmo3

VIP Member
Messages
555
Location
Wales
Vehicle
T5 Beach
It’s an easy DIY job, just order the OEM part (Pierburg).
 
Wildcamper

Wildcamper

Messages
211
Location
UK
Vehicle
T5 HighTop
My experience of the Moo (N75) valve was that it only Mooed on turning the engine off. This sounds to me more like the engine cooling fan which comes on when the air flow through the radiator is low, such as driving at low speed, and often runs on for a minit or so when the engine is turned off. When you next use the van be ready when you turn the engine off to open the bonnet and have a look. If it is the Moo valve get it fixed!
 
Meoncoast

Meoncoast

an Ocean by the Sea
Top Poster
VIP Member
Lifetime VIP Member
Messages
4,260
Location
Moorgreen
Vehicle
T6 Ocean 150
My experience of the Moo (N75) valve was that it only Mooed on turning the engine of
Ours did it both on the mooove and on stopping intermittently
 
Wildcamper

Wildcamper

Messages
211
Location
UK
Vehicle
T5 HighTop
I was told that eventually it can cause the turbo to fail. I have no first hand experience of this, I think I read this on the T5 forum. VW have a service fix for this on the T5 so I assumed it can't be nothing.
 
D

Dyddi

VIP Member
Messages
41
Vehicle
T5 Beach
Thanks for raising this. My 2012 T5 140 has been producing a strange noise very occasionally for about 5 years. 'Mooing' describes it perfectly. Usually heard when decelerating. Could we have the technical term for the valve so I can ask my local garage to fit, please?
 
Wildcamper

Wildcamper

Messages
211
Location
UK
Vehicle
T5 HighTop
Thanks for raising this. My 2012 T5 140 has been producing a strange noise very occasionally for about 5 years. 'Mooing' describes it perfectly. Usually heard when decelerating. Could we have the technical term for the valve so I can ask my local garage to fit, please?
N75 valve. When I had mine changed the local garage said they could not do it as the replacement needs to be coded to the engine. True or false I don't know so VW Swindon did it for about £150. They said their was a VW fix so VW know about it.
 

VW California Club

Top