miss g spot Posted August 18, 2008 Report Share Posted August 18, 2008 Hiya Can you help, went to newcastle friday car temp went to about 100 fan kicked in and it stableized at 100. came back the same... so al good i thought, went to Wales saturday the same temp went to 100 fan kicked in then car stablized same on the way back.... any way was driving local yesterday (shopping) and temp went right up tp 120 then the warning light came on. have spoke to Audi they said could be thermastat or water pump, how can i tell which it is. :confused: any off your help is appricated. guy at audi said last guy with Audi A8 had overheating problem and he had t'stat, rad, water pump and cos the front had to come off had the cam belt done as well... £1700.00 lots of money ...... Link to comment Share on other sites More sharing options...
Ska Posted August 18, 2008 Report Share Posted August 18, 2008 Welcome to TSN 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. Link to comment Share on other sites More sharing options...
Figure11 Posted August 18, 2008 Report Share Posted August 18, 2008 Hi, Welcome as per my post below. It could well be as the Audi main dealer has said. How many miles has the S8 done and what year is it? 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. 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..... Mike Link to comment Share on other sites More sharing options...
Ska Posted August 18, 2008 Report Share Posted August 18, 2008 Mike, I thought the thermostat was behind a pulley or something on the V8's? must be thinking of my one then. Link to comment Share on other sites More sharing options...
Figure11 Posted August 18, 2008 Report Share Posted August 18, 2008 This thread goes into overheating quite some depth http://www.tyresmoke.net/forum/audi-a8-s8/82682-engine-over-heating.html From Audi Pages (thanks Paul W) this photo: 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! Mike Link to comment Share on other sites More sharing options...
Figure11 Posted August 18, 2008 Report Share Posted August 18, 2008 Here's abeter picture: 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. Mike Link to comment Share on other sites More sharing options...
harpersimon Posted August 18, 2008 Report Share Posted August 18, 2008 Mike, I thought the thermostat was behind a pulley or something on the V8's? must be thinking of my one then. oh you can change a v6 without all the front off then? worth knowing.. Link to comment Share on other sites More sharing options...
Ska Posted August 18, 2008 Report Share Posted August 18, 2008 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. Link to comment Share on other sites More sharing options...
Figure11 Posted August 18, 2008 Report Share Posted August 18, 2008 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. AudiWorld Forums: Thermostat Change on 40 V 4.2 There are several posts to this effect. Unfortunately my Elsawin is playing up so I'm off to reinstall it. Mike Link to comment Share on other sites More sharing options...
PsYcHe Posted August 18, 2008 Report Share Posted August 18, 2008 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). 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. 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. Link to comment Share on other sites More sharing options...
LostKiwi Posted August 18, 2008 Report Share Posted August 18, 2008 (edited) 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) Found - http://www.tyresmoke.net/forum/audi-a8-s8/102467-strange-temp-guage-readings-3.html Edited August 18, 2008 by LostKiwi Link to comment Share on other sites More sharing options...
Tobes49 Posted August 18, 2008 Report Share Posted August 18, 2008 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). 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. Link to comment Share on other sites More sharing options...
Figure11 Posted August 18, 2008 Report Share Posted August 18, 2008 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)Found - http://www.tyresmoke.net/forum/audi-a8-s8/102467-strange-temp-guage-readings-3.html 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. Arrrrrrrrrr the warm self righteous feeling of vindication! Mike Link to comment Share on other sites More sharing options...
Ska Posted August 19, 2008 Report Share Posted August 19, 2008 Arrrrrrrrrr the warm self righteous feeling of vindication! Mike 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: Link to comment Share on other sites More sharing options...
Tobes49 Posted August 19, 2008 Report Share Posted August 19, 2008 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: There more room if you strip all the things you dont need out Link to comment Share on other sites More sharing options...
Ska Posted August 19, 2008 Report Share Posted August 19, 2008 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: Link to comment Share on other sites More sharing options...
cruiser647 Posted August 19, 2008 Report Share Posted August 19, 2008 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. Once the front comes off, you might as well change the belt, pump and thermostat. 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. 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! Link to comment Share on other sites More sharing options...
LostKiwi Posted August 19, 2008 Report Share Posted August 19, 2008 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...... And Tobes... there must be at least a mile or two of wires you can still strip out of that thing!!! Link to comment Share on other sites More sharing options...
harpersimon Posted August 19, 2008 Report Share Posted August 19, 2008 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.Once the front comes off, you might as well change the belt, pump and thermostat. 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. 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! No way!? I see.. one piece of diagnostic software for most jobs and 'VEGcom' for the rest. 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? Link to comment Share on other sites More sharing options...
LostKiwi Posted August 20, 2008 Report Share Posted August 20, 2008 No way!? I see.. one piece of diagnostic software for most jobs and 'VEGcom' for the rest.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? Not with a courgette, but if you stick sprouts into the inlet and it stalls its well and truly cabbaged.... ;-) Link to comment Share on other sites More sharing options...
Tobes49 Posted August 20, 2008 Report Share Posted August 20, 2008 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: We have only been drag racing in it so far, We ran the track one against Botangs, At GTI international with a major headwind Track one: Stock (junk removed) 0-60: 5.78 1/4: 14.4 Botangs: (air filter and exhaust) 0-60: 7.83 1/4: 15.96 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 Link to comment Share on other sites More sharing options...
cruiser647 Posted August 20, 2008 Report Share Posted August 20, 2008 No way!? I see.. one piece of diagnostic software for most jobs and 'VEGcom' for the rest.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? Yep, use a potato and you get chips.......... Link to comment Share on other sites More sharing options...
Oli18 Posted August 20, 2008 Report Share Posted August 20, 2008 Track one: Stock (junk removed) 0-60: 5.78 1/4: 14.4 Botangs: (air filter and exhaust) 0-60: 7.83 1/4: 15.96 Sub 6 seconds....awesome!!! Imagine a facelift S8 with 360 bhp in 'stock' form...reckon it would go sub 5 seconds?? -Oli Link to comment Share on other sites More sharing options...
ferguson19 Posted December 23, 2008 Report Share Posted December 23, 2008 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. Link to comment Share on other sites More sharing options...
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