Mystery noise from under the hood

**Sunny43.5** · 12-11-2016, 03:32 PM

Had to laugh today while researching the N75 valve on one site they describe it as the "Moo "valve a good sense of humour there . About to order one from OS not paying the local thieves the money they quote .

**LogicprObe** · 19-11-2016, 08:04 PM

That is low kms!
I'm up to 280k.

**REVHE4D** · 19-11-2016, 08:11 PM

Originally Posted by LogicprObe

That is low kms!
I'm up to 280k.

I had my n75 i think it was called replaced and my van had done less than 25000km. This would be your issue

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**REVHE4D** · 19-11-2016, 08:12 PM

Originally Posted by LogicprObe

That is low kms!
I'm up to 280k.

280km wow hows is your dpf holding up? Im on 135k

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**Markee** · 20-11-2016, 06:24 AM

There are modified vacuum hoses with pulsation damper offered as a 'production change' from VW. They are $200 each plus fitting. I am going to try this before changing out the N75 "Moo Valve" as stated everywhere else online.
The newer design hoses are a 'VW upgraded part' from VW's Technical Product Information sheet 2027520/13
I'm looking to buy the set from the UK as they are half the price. See my other thread about OEM parts suppliers from overseas.

**Markee** · 20-11-2016, 06:28 AM

Originally Posted by Sunny43.5

Had to laugh today while researching the N75 valve on one site they describe it as the "Moo "valve a good sense of humour there . About to order one from OS not paying the local thieves the money they quote .

Hey Sunny where about's are you ordering your parts from?

**Rebuild** · 20-11-2016, 12:51 PM

removed the mounting bracket,removed hoses and sprayed WD40 into all openings on each of three valves i could see.
Will see if it returns.

**Silver Caravelle** · 23-11-2016, 05:29 PM

Mine has been noisey for a number of years (2008 Multi). I recently asked the dealer servicing it whether the N75 should be changed, They said unless it is triggering a fault code and not working, not need to change. I suppose the moo noise is an 'undocumented feature' on VW/Audi vehicles. I gave mine a clean a while back, there was no change, still the moo noise but functioning fine when tested on the 12 v battery.

Regards,

Scott

**REVHE4D** · 25-11-2016, 07:23 AM

Mine was flucuating ever so mildy under throttle, you could feel it under slow driving in a carpark in first gear, this annoyed me. Since I had mine changed 5 years ago it has never come back.

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