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D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
#1
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HVAC whistles like a boiling kettle.
Hi all. Anyone had this? It’s louder with speed of car. Oddly silences when switched to recirculate air.
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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. |
#2
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If its still got the same air con compressor as the D2 then it could be the electro-magnetic clutch on it singing when the air con is on, if i turn mine to eco then the noise stops. Getting the compressor swapped soon on it
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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 |
#3
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Cheers for that. Any idea why it would silence on recirculation? I can see why it would on ECO.
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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. |
#4
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maybe on recirc the aircon function is cut as its just wanting to recirculate what air is in the car, but its just a guess.
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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 |
#5
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Yeah. I don’t think it does cut the A/C. Hope your compressor swap isn’t too painful.
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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. |
#6
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Might be a jammed flap, creating a restriction.
Have you tried opening/closing different vents to see if it changes (or to see if you can get a tune ) ? If you find the note of the whistle is affected more by certain vents it might provide a clue as to what/where the restriction is.
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------ ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust |
#7
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I am pretty sure D3 will have permanently driven compressor without a clutch.
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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 |
#8
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A/C compressor is permanently driven with variable output (no clutch).
I would focus investigation under the pollen filter. Open the bonnet Remove rubber seal (weather strip) Remove left and right plastic cowels (where the brake fluid reservoir peeps through. Use a large flatblade screwdriver to press and undo 4 plastic retaining screws 90degrees. Lift pollen filter housing and filter together towards you and upwards while holding filter in housing underneath with your fingers. Look into void covered by filter. Operate recirculate and observe flap actions and noises. When reassembling, ensure that the 2 spikes on the windscreen cowel insert into the rubber gutter spouts on filter housing. Another thing is air is entering the car and has to leave somewhere, normal place is vents behind the trim in the boot but could be a gap in windows or doors, check windows are shut and sealed. In recirc mode, the air is no longer leaving the car so no whistle in any holes or gaps. |
#9
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I had something like this in a car many years ago.
Resolved to a dried leaf. Hope that it is a cheap fix.
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Ray at Wigan Pier 2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore.. In progress, Nothing left to do. Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter) |
#10
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Thanks for all the replies. I replaced the blower motor a year or so ago, so know all about that fiddly business.
The noise is the same whatever way the air is directed. It does sound like its coming from behind. And was after I’d changed two door handles and a lock actuator. Can’t see how related, as no gaps in window closure, door cards back on well etc. But maybe I’ve missed something Snap’. Thanks for the input. Will have to revisit when not dark and/or raining. Where was said leaf Ray?
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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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