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D4 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
#1
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Help needed With S8 heating
So yesterday I got in the car to go to work and there was no heat what so ever from the blowers?
Stone cold, even after the engine fully warmed up, and coolant tank is full. I have done a full vcds scan with only 1 fault on HVAC "Function limitations due to missing messages" I am told the S8 has 4 radiators and a series of valves that open and close allowing the coolant to flow to various places as and when required. Also there 3 or 4 additional electric coolant pumps and after run pumps etc.. I have no diagrams and nothing to go by ... day two in a cold misty S8 is not so fun... any help would be appreciated 2014 S8 factory standard KR Ian |
#2
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Take a look in the D4 Tech Dump which is HERE and there should be "Service Manual 26 - Heating & Air Conditioning"
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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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Thank you for that. I did see that and look through and could not see what I am looking for. Seems to be a valve block that controls coolant flow to the heater core that causes the issue and it's the location of this little devil that has eluded me
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#4
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See existing thread on heating in "D4-Everything Else" section
Electric Coolant pumps are prone to failure. http://forum.a8parts.co.uk/showthread.php?t=12290 |
#5
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Can you post a vcds scan of your car?
The missing messages sounds like a problem on communications.
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Del |
#6
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Oh how embarrassing. .... it was my own fault... on my 4.2 tdi I coded in Auxiliary heating because even without the burner, the 4.2tdi has electric heating in the vents because of length of time it takes to heat up the iron lump. The S8 does not have the electronic elements like the tdi. So when I coded it in, it shut off the valves for the coolant to flow to the cabin. So I've coded it out and all is good now
700+ ponies under the bonnet and no heating, what a disaster.... |
#7
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Good stuff. 700 ponies I bet that's fun to drive
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Del |
#8
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Scary at times! But relentlessly fast |
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