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#1
18th August 2015, 06:46 AM
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Cooling system problems?
I thought I'd better continue this in the D2 section.
My car went in to Audi Technik yesterday to have the cooling system checked, but it came back 'all clear'. But, the car is still running fine at motorway speeds, sticking to a steady 90C, but then in slower traffic the needle starts to rise towards the next mark on the gauge (BTW, what do those marks represent - see photo - they're not obvious intervals to me, so I don't know if it's heading up to 95C or 100C). IIRC (and I may not be right) it used to sit at 90C all the time. What about other D2s out there - a steady 90C regardless, or does it move up and down a bit?
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!). Last edited by The_Laird; 18th August 2015 at 07:28 AM. 
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#2
18th August 2015, 07:37 AM
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Mine's rock steady on the midpoint of 90 (even though, as Mark/Moltuae pointed out @ Wigan, my coolant is below minimum
 ). But 98% of my driving is motorways or fast A roads, so I'm probably not a good comparison. Maybe a problem with the radiator, I guess?I've no idea what the gradient marks mean, as it doesn't seem to be a linear scale...
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#3
18th August 2015, 08:13 AM
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Mine is always 90C.
I have had thermostat problem when I purchased the car, and it didn't warm up no matter how hard the car was driven. The needle went to 70C - 80C and stayed there. Edit: I would change sensor that starts radiator fan. It is located at the bottom of for radiator, on driver side corner of radiator and is facing the engine. Can be changed with the bottom plastic shield out when the car is on ramps.
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I'd rather drive on left Last edited by notorious; 18th August 2015 at 08:35 AM.
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#4
18th August 2015, 08:48 AM
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The garage checked that the fans were coming on when they should, and I can see that both are running when the engine is hot.
Now, I have a small confession and I wonder if this is relevant. I had a very tiny leak in the radiator and threw in a bottle of Radweld. It's cured the leak, but could this be causing the over-heating issue?
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!). Last edited by The_Laird; 18th August 2015 at 10:56 AM.
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#5
18th August 2015, 09:01 AM
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My previous S8 always stayed exactly at 90 even in Spain. The current one started creeping above 90 only on one day when it sat in traffic in London on a hot summer day. After that it went for a belt change and had a new thermostat and waterpump, hasn't done it since. So it could have been either of those. And I think its had a new viscous fan clutch too.
Last edited by Goran; 18th August 2015 at 09:04 AM.
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#7
18th August 2015, 01:54 PM
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Quote:
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2002 Final Edition S8. Ebony black with Silver Grey leather and myrtle wood trim. Current mods: solar sun roof, 20mm rear spacers, 15 mm on front, red brembo callipers, 6k headlights, rear view camera, engine remap, alloy dash dial rings, alloy navi rings, tt/phaeton pedal upgrade, (and custom matching foot rest) dension ipod interface & parrot hands free kit (both fully hidden), av input, tv in motion switched thro' PF switch in blanking plug right of steering column, Audi 'quattro' sill covers, repositioned centre console switches, radio clock, .Planned mods: auto-dimming rear view mirror, dash cam (as steamship's), fit the ski hatch, refit philips drl's (or maybe not - nope, definitely not - horrible botch!).
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#8
18th August 2015, 06:18 PM
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My D2 has always been a constant 90c as well Jim
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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
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#9
18th August 2015, 06:42 PM
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Bang on 90 for me, in every Audi ever. In fact, if I never saw them warm up from the far left, I swear it was just a sticker...
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For parts enquiries and Forum User Administration please contact customer services directly, not me - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black  , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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#10
18th August 2015, 07:30 PM
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Same here.
Always rises to 90 then stays there .... apart from when I had a coolant temp sensor fault (when the needle stuck at zero), and the time I lost all of my coolant while right-footing it down the motorway (causing the gauge to move up slightly). I wonder if your thermostat is sticking a little, or opening late. It's possible the Radweld is responsible if that's the case, especially if it started happening just after that. Might be worth checking the temp with VCDS (assuming VCDS can read the CTS temperature - never tried it myself) just to confirm whether the ECU is seeing the same temperature the gauge is reporting ... though I suspect it will be.
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