Intermittent ‘growl’

[Sallyf]

For the past month our five-year-old T5 has occasionally produced a 1–2 second low growling noise. I cannot be specific about when it happens. The noise seems to come from the front end of the van. Everything appears to be working well. Any ideas about what might be causing it very welcome.

 

[Meoncoast]

Moo Valve/N75 valve ? is it a 180

https://vwcaliforniaclub.com/threads/strange-noise.15268/#post-164479

 

[Cali-on-Camping]

This may sound strange but could it be more of a 'Moo' sound? There is a valve that is part of the turbo system that is known to 'Moo'. Our 2012 180 SE does it now and again and when i put it in for its last service I was told that it shouldn't affect performance.

https://vwcaliforniaclub.com/threads/n75-moo-valve.13764/

 

[jts46]

For the past month our five-year-old T5 has occasionally produced a 1–2 second low growling noise. I cannot be specific about when it happens. The noise seems to come from the front end of the van. Everything appears to be working well. Any ideas about what might be causing it very welcome.

Please fill in details of your vehicle as it is important if you want a correct reply and/or help

 

[Meoncoast]

service I was told that it shouldn't affect performance

but will drive you mad

 

[Cali-on-Camping]

but will drive you mad

He did say come back when it drives you mad... It's not that frequent at the moment and if the family are in the car, we all moo back at it!

 

[Meoncoast]

He did say come back when it drives you mad... It's not that frequent at the moment and if the family are in the car, we all moo back at it!

our's got to the stage when it did it every trip

 

[Cali-on-Camping]

I don't have too much of a threshold for annoyances so I reckon it'll be replaced in May when it's in for MOT.

 

[AlanC]

The official VW fix is not to replace the valves but the silicon tubing that the valves are attached too.
It is so nice when the noise has gone, I almost miss it....almost!

Alan

 

[NShep]

My bus makes a noise like a moo / growl when the blue motion kicks in and the engine switches off. Is that what you are talking about? I am sure the growls are getting more frequent.

 

[petethebeat]

Yep mine did it, N75 valve, 'moo valve' had it changed at the garage, all sorted now. Simples.

 

[Borris]

For the past month our five-year-old T5 has occasionally produced a 1–2 second low growling noise. I cannot be specific about when it happens. The noise seems to come from the front end of the van. Everything appears to be working well. Any ideas about what might be causing it very welcome.

Is it coming from the passenger seat?

 

[WelshGas]

Is it coming from the passenger seat?

No, that was a whimper.

 

[Lost Boy]

This may sound strange but could it be more of a 'Moo' sound? There is a valve that is part of the turbo system that is known to 'Moo'. Our 2012 180 SE does it now and again and when i put it in for its last service I was told that it shouldn't affect performance.

https://vwcaliforniaclub.com/threads/n75-moo-valve.13764/

Can affect performance and has been known to cause a turbo fault if left untreated

 

[vmaxkiddy]

Can affect performance and has been known to cause a turbo fault if left untreated

Very true, can lead to a turbo overboost, which will cause the engine to go into limp mode.