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Old 7th November 2019, 07:21 AM
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Default HVAC whistles like a boiling kettle.

Hi all. Anyone had this? Itís louder with speed of car. Oddly silences when switched to recirculate air.

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CURRENT CAR: Quartz gray 2008 A8 3.0 TDi. My installs: (2009) AMI and ViseeO Tune2Air WMA3000A, generic RVC, Westfalia OEM towbar, D4 19s and S8 MFSW with paddles.

LAST CAR: Black 2001 A2 1.4 TDi, winter pack, leather/alcantara sports seats, DIS and BrokenSky
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Old 7th November 2019, 07:47 AM
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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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Old 7th November 2019, 07:49 AM
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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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CURRENT CAR: Quartz gray 2008 A8 3.0 TDi. My installs: (2009) AMI and ViseeO Tune2Air WMA3000A, generic RVC, Westfalia OEM towbar, D4 19s and S8 MFSW with paddles.

LAST CAR: Black 2001 A2 1.4 TDi, winter pack, leather/alcantara sports seats, DIS and BrokenSky
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Old 7th November 2019, 07:51 AM
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Quote:
Originally Posted by Johnmed View Post
Cheers for that. Any idea why it would silence on recirculation? I can see why it would on ECO.
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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Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange
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 D3 4.2 Petrol with LPG - Oyster Grey
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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Old 7th November 2019, 07:53 AM
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Yeah. I donít think it does cut the A/C. Hope your compressor swap isnít too painful.
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CURRENT CAR: Quartz gray 2008 A8 3.0 TDi. My installs: (2009) AMI and ViseeO Tune2Air WMA3000A, generic RVC, Westfalia OEM towbar, D4 19s and S8 MFSW with paddles.

LAST CAR: Black 2001 A2 1.4 TDi, winter pack, leather/alcantara sports seats, DIS and BrokenSky
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Old 7th November 2019, 08:05 AM
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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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Old 7th November 2019, 09:58 AM
ainarssems ainarssems is offline
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Quote:
Originally Posted by Architex_mA8tey View Post
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
I am pretty sure D3 will have permanently driven compressor without a clutch.
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Old 7th November 2019, 12:27 PM
snapdragon snapdragon is offline
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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.
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Old 8th November 2019, 09:58 AM
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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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Old 14th November 2019, 05:32 AM
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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 Iíd changed two door handles and a lock actuator. Canít see how related, as no gaps in window closure, door cards back on well etc. But maybe Iíve missed something Snapí. Thanks for the input. Will have to revisit when not dark and/or raining.

Where was said leaf Ray?
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CURRENT CAR: Quartz gray 2008 A8 3.0 TDi. My installs: (2009) AMI and ViseeO Tune2Air WMA3000A, generic RVC, Westfalia OEM towbar, D4 19s and S8 MFSW with paddles.

LAST CAR: Black 2001 A2 1.4 TDi, winter pack, leather/alcantara sports seats, DIS and BrokenSky
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