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#1
13th March 2013, 02:27 PM
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No hot air!
I've got a FL 4.2 Q Sport. Slightly odd ventilation problem. No hot air.
Normally if I start the car from cold the fans won't start to blow warm air until the engine is producing warm air - then the vents will come to life and the fan speed picks up. As of last week though the fan speed stays resolutely on one bar, no matter what temp I select (with the exception of LO - then it blows a gale and won't stop blowing a gale until the engine is switched off and on again). So, a flap - I guess - is staying closed and diverting hot air from the engine bay away from the cabin. The question is whether the motor that opens the flap is done in or whether a sensor in the cabin is done in. Has anyone experienced anything similar, and if so, can they offer a ballpark cost to remedy? TIA 
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#2
13th March 2013, 02:31 PM
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Could be an easy fix, its the diag thats more tricky
 Get someone with Vagcom in your area to run an output test on the HVAC unit, and then check for errors... That should get to the bottom of it fairly quickly...
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For parts enquiries and Forum User Administration please contact customer services directly, not me  - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black  , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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#3
13th March 2013, 03:30 PM
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I don't think it's flap. If it was flap fan would still be picking up speed just blowing cold or in wrong direction depending which flap. Can You adjust fan speed manually using?
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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 Last edited by ainarssems; 13th March 2013 at 03:34 PM.
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#4
19th March 2013, 03:02 PM
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Yes, I can adjust the fan speed manually, and no, the fan speed didn't change unless I did. So I tend to agree that that rules out a flap.
Anyway, further developments. We have had a slow leak somewhere in the engine coolant system. Last weekend the red thermometer appeared on the dash. I topped the coolant up and limped the car home. It's now at the garage, who've reported a leaking coolant pump. They also think that the lack of hot air could be related (they suggested an airlock somewhere) such that getting the engine coolant working might clear the AC/heating problem. I confess that I find this difficult to follow or understand. Oh, and since it's almost due the cambelt service at 75000/80000/whatever miles, they've suggested that's rolled in too. It's all got a bit expensive all of a sudden. Expensive as in more than the value of the car expensive... Update:
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#6
21st March 2013, 05:22 PM
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Quote:
Why did it think that the hot air was heated by letting it waft generally over the engine? 
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Linear Mode
