MechExp6 months ago

Once the front comes off, you might as well change the belt, pump and thermostat.

Matchmaker15 months ago

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R2_Amazeballs4 months ago

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Matchmaker14 months ago

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

MechExp4 months ago

I'd say £1700 is taking the mick, £800-£1000 is a more normal dealer price, some of the independents will do it for less, though be careful where you go, V8's can go very expensively wrong.

Corrie19994 months ago

Shows the thermostat housing with the covers still on. I am under the bonnet of mine this afternoon, I'll have a look. Taking apart the whoile front end to change the thermostat is not cleaver design!

Porker4 months ago

Found - http://www.tyresmoke.net/forum/audi-a8-s8/102467-strange-temp-guage-readings-3.html

Red4 months ago

Damn... Have you done any trime trials on that Tobes? How does it compare to standard? Who knows if its big difference I might get rid of my spare wheel and go on a slim fast diet and wash the car more often to reduce skin friction drag:grin:

Fionas_Boy4 months ago

If it's a pre-facelift, (no fogs on the bumper), then it's a timing belt off job to replace the thermostat as it's in the way. If you need to get the belot off, then it costs buttons more to do all the other stuff in there (belt, tensioners, pump, etc).

petHead4 months ago

There are several posts to this effect. Unfortunately my Elsawin is playing up so I'm off to reinstall it.

Corrie19994 months ago

However, first of all, I think you need to do the 'carrot' test on the viscous fan. See if the viscous fan is up for the job.

MechExp4 months ago

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Red4 months ago

Had a look this afto and it looks to me like it's just 2 torx screws and off it comes. Found this post on Audiworld regarding a 40V motor.

Mary4 months ago

Not with a courgette, but if you stick sprouts into the inlet and it stalls its well and truly cabbaged.... ;-)

Col Minessota4 months ago

We have only been drag racing in it so far, We ran the track one against Botangs, At GTI international with a major headwind

petHead4 months ago

We have all most finished getting the car ready for a test session, Just got to lower the front and get some new tyres. looking at Audi driver in October

Matchmaker14 months ago

Yes V6's have much more room in front of the engine than the V8's so the front end stays on to do a cam belt change, but I do recall (albeit vaguely) that the thermostat housing on the V6’s was obscured by something like the timing belt or pulley. But it makes sense to change the thermostat as Mike says and seeing if the problem is resolved then move onto the water pump.

FordOwner4 months ago

http://www.tyresmoke.net/forum/audi-a8-s8/82682-engine-over-heating.html

Corrie19994 months ago

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Corrie19994 months ago

Wash it? Current thinking is to make the surface rough (same as thhey do for the olympic rowboats these days) so as to reduce the barrier effect of the air flowing over the surface (skin friction drag)... Time to get out the rough sand paper......

Corrie19994 months ago

He is right in getting the pump and thermostat done in one go as the whole front end of the car will need to comes off. As for the price I'm sure you can get it done much cheaper by a competent indipendent (have seen of quotes of around £800 on here). While your at it you may as well change the timiming belt as well seeing as that has to come off to remove the pump and thermostat. Oh and normaly the engine temp is around the 90 mark not 100 so change the lot and check the viscous fan as well.

Col Minessota4 months ago

Does that work with all veg? are there different vegetables that indicate different failures? If I stick a courgette up the exhaust for instance it it stalls, is my engine shagged?

Gary19964 months ago

I did Botangs thermostat (ABZ 4.2 32v) just removed the top hose, disconnected the lower rad hose and you can get into change it no problem. Took about 45min start to finish.

Watergirl4 months ago

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MDG Ltd4 months ago

What year is the motor in the picture and what size. I have a 4.2L but its an A8 not an S8, the motor is built the same right? i need to replace my thermostat its only partially open.

R2_Amazeballs4 months ago

Audi A8 thermostat fault

The Cambelt should be done at every 80k and at the same time as most people on here have the Waterpump and thermostat are aslo changed as a precaution.

Watergirl4 months ago

oh you can change a v6 without all the front off then? worth knowing..

FordOwner4 months ago

I did the thermostat on mine and its a doddle to do in place. Somewhere if you search on here you'll find my how to guide....(with pics)

MDG Ltd4 months ago

I 'think' it is possible to cjange just the thermostat. I'll see if I can find the process. If it can be done I would change that first. If it ain't that then its either your waterpump or something more serious.....

MechExp4 months ago

Warm up, have the viscous fan 'fanning' and slowly stick a carrot in. If the fan stops, your fan coupling is knacked. If you get carrot slices, then the fan is fine!

Watergirl4 months ago

OK OK smarty pants!:grin: Don't let it go to your head there's only so much room in an A8 cabin you know:grin:

MechExp4 months ago

And Tobes... there must be at least a mile or two of wires you can still strip out of that thing!!!

Bri19874 months ago

It could well be as the Audi main dealer has said. How many miles has the S8 done and what year is it?

Red4 months ago

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Col Minessota4 months ago

There more room if you strip all the things you dont need out

Pete_W4 months ago

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Matchmaker14 months ago

From Paul W's Audipages. I reacon unless there is some interferance from the Cambelt covers that the thermostat can be changed without a front end off approach. I'll check and get back.

Col Minessota4 months ago

Also.. Have you checked the coolant? It should be a funny pink colour (special Audi stuff), also, try it without the Aircon on, the compressor can generate quite a bit of heat when it goes wrong.

Corrie19994 months ago

Warm up, have the viscous fan 'fanning' and slowly stick a carrot in. If the fan stops, your fan coupling is knacked. If you get carrot slices, then the fan is fine!

Bri19874 months ago

Have to agree with the diagnosis, the 32v V8 thermostat is in a from the 40v thermostat. Also, the 40v thermostat is a weak point apparently.

Bri19873 months ago
This problem has been solved

- see solution here