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#1
14th February 2013, 08:50 PM
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Overheating
Today the red 'overheating' symbol came on on the DIS.
The temp gauge was at about 120 Degrees C. Stopped and found the rad to be cold. Coolant system full of coolant and no leaks. Headertank very hot, boiling in fact. Car trailered away to the garage- clearly a circulation fault so either pump not pumping (belt???? Pump???) or thermostat stuck closed?? Any ideas?? What drives the w/pump on these? The timing belt? I've a funny feeling they didn't do the water pump at the last belt swap (70,000). Miles now 130,000. 
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#2
14th February 2013, 09:31 PM
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Water pump is driven by a drive belt not the timing belt. Could be a blocked radiator but if the pump wasn't changed then that is the most likely suspect.
What sort of garage changes a timing belt and not the water pump 
__________________
. Nite Blue 3.0L SE Quattro 
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#3
14th February 2013, 10:52 PM
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47P2
I will advise that later, The receipt is in the car. Clearly, a false economy. I suspect this is a failed w/p, but I suppose I might get lucky...w/p drive belt?? Doubt it though, as the elec sys is normal and I bet that same belt drives the alternator
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#4
14th February 2013, 11:15 PM
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Thermostat closed
I would say the thermostat is staying closed if the radiator is cold.....
__________________
01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012
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#5
14th February 2013, 11:33 PM
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Ranji
Yep. A failed therm would do it for sure. Thing is, to get at the therm, is the same as doing the w/p, might as well do the belt too. I tried letting it cool off, in case it was a 'one off' stuck therm- as seen on old cars which I can fix. No joy. Bucks!
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#6
15th February 2013, 04:22 AM
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Changing thermostat
Probably is worthwhile doing the lot as it probably due.....but have a look on Quattro world I m sure there was a thread where someone managed to change the thermostat without removing the belt....,
__________________
01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012
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#7
15th February 2013, 07:01 PM
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Car problem yesterday at about 3 pm.
Car ready for collection today at about 3pm. 'A for Audi' up here in Glasgow changed the wp, therm and fitted a new timing belt kit. Was a stuck therm btw. Hats off to Andy at A for Audi! Hot, or what? 
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#8
15th February 2013, 07:10 PM
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Excellent work! They certainly do get some positive reports at A for Audi - glad you got it sorted so quickly
__________________
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
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#9
16th February 2013, 12:53 PM
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i find it amazing that the W12 requires non of that to change the thermostat just removal of the intake manifold thankfully
top job well spoted and not to cook the engine
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#10
16th February 2013, 04:20 PM
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Well, the story gets better.....
The car had clearly not been timed properly when the last belt was fitted. It is noticably more lively now and even sounds more growly! I looked at the invoice again for the previous timing belt change. Parts include the belt itself, oil, plugs, engine flush etc, but no mention of a water pump or therm or related gaskets. In fact A-for Audi bought the kit of parts to do the belt which I think includes other parts like tensioners etc and costs about £300. I think the previous lot just bought a belt- for £67.80, as that's all they charged out. Also, clearly they haven't fitted the timing belt spot-on, because the thing now runs better. Company to avoid (if they're still trading) is Nitro Performance of Chesterfield, Derbyshire.
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