A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D3 > D3 - Engine Bay

D3 - Engine Bay Everything under the bonnet

Reply
 
Thread Tools Display Modes
  #11  
Old 20th May 2019, 01:41 PM
Johnmed's Avatar
Johnmed Johnmed is offline
Senior Member
 
Join Date: Dec 2014
Location: Cheshire
Posts: 1,601
Default

I was think bearings or something internal to the compressor. Sounds about right^
__________________
2010 A8 SE Executive 4.2 FSI D4

2007 Mini Cooper S R56

2008 D3, gone, but not forgotten after 9 years and 90k.
Reply With Quote
  #12  
Old 20th May 2019, 01:53 PM
ainarssems ainarssems is offline
Senior Member
 
Join Date: Aug 2010
Location: Rushden, Northants
Posts: 3,799
Default

D3 should be permanently driven compressor without a clutch with a pressure regulating valve instead. Still could be making noise when putting load on it.
__________________
Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D

8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Reply With Quote
  #13  
Old 20th May 2019, 02:00 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

Dean had this with his S8 and it was the bearings in the compressor. We put a new one on and the noise was no more.

I actually had to label the compressor so I knew it was duff and didn't make its way in to 'good used stock', since you couldn't feel anything untoward spinning it by hand, and the clutch was fine. It was only under load at engine speed that it made the noise.
Reply With Quote
  #14  
Old 27th August 2019, 08:29 PM
Johnmed's Avatar
Johnmed Johnmed is offline
Senior Member
 
Join Date: Dec 2014
Location: Cheshire
Posts: 1,601
Default

Just thought I'd add that before we went to France this summer I had the A/C's refrigerant replaced. The cabin was taking 15-20 mins to cool. I'd noticed over the years, it had been taking longer and longer to cool, but once cool kept cool.

The level of refrigerant was just over half of what it should've been.

Now the A/C is noticeably colder, quicker to cool and quieter. I'm not certain, but I think the fan isn't having to spin as fast etc.

Did 2,200 miles over the last few weeks in France and so far haven't noticed the annoying whine.

This could be because I had the wife and kids with me tho', maybe their whines were louder!

I'll have a proper listen tomorrow.
__________________
2010 A8 SE Executive 4.2 FSI D4

2007 Mini Cooper S R56

2008 D3, gone, but not forgotten after 9 years and 90k.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:59 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.