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#2
20th May 2019, 10:43 AM
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I’ve just tried to capture the noise. Cycling between HVAC Econ on/off.
Not really found a way yet, to get it to be picked up by my phone’s mic.
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2010 A8 SE Executive 4.2 FSI D4 2007 Mini Cooper S R56 2008 D3, gone, but not forgotten after 9 years and 90k. 
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#3
20th May 2019, 12:39 PM
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I'd guess at the magnetic clutch on the aircon compressor beginning to fail, when the econ button is pressed it doest try to engage, but when the aircon is required the magnetic clutch should cause the aircon pump/compressor to drive off the engine/belt. . .
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Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#4
20th May 2019, 12:41 PM
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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.
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#5
20th May 2019, 12:53 PM
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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.
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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
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#6
20th May 2019, 01:00 PM
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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.
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#7
27th August 2019, 07:29 PM
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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.
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2010 A8 SE Executive 4.2 FSI D4 2007 Mini Cooper S R56 2008 D3, gone, but not forgotten after 9 years and 90k.
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