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D3 - Engine Bay Everything under the bonnet

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  #11  
Old 14th September 2018, 09:43 PM
paulrstaylor paulrstaylor is offline
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Originally Posted by IT View Post
Sounds like your Aux heater aint working, which isn't uncommon.

D3 4.2 TDi should heat up reasonably quickly.

D4 4.2 Tdi they did away with the engine heater, and put electric elements in the air flow to the cabin instead, so the engine takes ages to warm up, but you get warmth in the cabin straight away.
Doesn't it only come on when actually cold and there is demand for heat from the a/c, as in winter?
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  #12  
Old 15th September 2018, 09:55 AM
Mechcanico Lee Mechcanico Lee is offline
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IIRC aux heater only becomes active when ambient temp gets down to 6 degrees or around that .

If you feel that it is taking to long to get warm ,like already said it could be a thermostat issue ...opening to soon or not fully closing allowing partial flow through the radiator.

As a bit of a ‘bog ‘ just for *testing purposes* if you slip some cardboard in front of the radiator ( like ya used to see in’th olden days ...Ray will know ! ) just to stop air flow to it ....if it then gets warm much quicker you know your on the correct track .

There is a few other things that can cause slow warm up ....any ideas technical guys ?? Just out of interest so
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  #13  
Old 15th September 2018, 11:17 AM
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MattyV8 MattyV8 is offline
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Cheers mate
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  #14  
Old 15th September 2018, 11:40 AM
tc4332 tc4332 is offline
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Quote:
Originally Posted by Mechcanico Lee View Post
IIRC aux heater only becomes active when ambient temp gets down to 6 degrees or around that .

As a bit of a ‘bog ‘ just for *testing purposes* if you slip some cardboard in front of the radiator ( like ya used to see in’th olden days ...Ray will know ! ) just to stop air flow to it ....if it then gets warm much quicker you know your on the correct track .

Cheeky booger Lee.
I'm not doing anything today so I might bring the boys round to have a word


I used to be in charge of the honorable ancient blowlamp for warming up Boadicea's chariot wheel knives. It made the blood flow easier after cutting.
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2004 A8 D3 3.0 TDI.
Ebony Pearl Black (with little bits of other colours and glitter), Auto dim mirrors
Added AMI, two Aux inputs and RSE output to TV Tuner, Dash camera, non OEM Tyre Pressure monitor, full Trups LED lights, Xenon HIDs in Dip headlights (by Trups), non OEM Reversing camera, swapped TV Tuner to a Hybrid, Puddle light projectors, DRL's (auto dim with sidelights) fitted in foglight grills. DAB radio with replaced Audi aerial.



In progress, Rear Seat Entertainment.
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  #15  
Old 9th October 2018, 06:07 PM
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snapdragon snapdragon is offline
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https://audi.7zap.com/en/rdw/audi+a8.../1/121-121039/
Part 6 on this diagram is a common failure that results in cool running/slow warmup due to bypassing the main thermostat and continually circulating the radiator and autobox cooler.
They are about £15 new on ebay.
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Old 10th October 2018, 09:55 PM
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MattyV8 MattyV8 is offline
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I have been reading on that fix - do you have any info on replacement of this part?

Thanks for your help.
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