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#1
22nd October 2010, 01:38 PM
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New Thermostat Required?
My temperature guage is a little erratic and wavers around between about 70C and 90C, but rarely gets as high as 90. Does this suggest a knackered thermostat?
If so, where is it and how easy/difficult is it to replace? Or is it something more sinister? 
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#3
23rd October 2010, 09:39 AM
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If arrow is unstable and "jumping", then it's sender or instrument panel issue since coolant can't change temperature that fast.
If in long traffic jam it gets up to 90 and then slowly drops to 70 when you drive faster, then it's thermostat. In other words, if your car only warms up to full 90 when parked or when you drive very slowly, then it's thermostat in my opinion. Changing thermostat on 4.2 and 3.7 requires removal of cambelt (not sure about 2.8 and diesel engines). If cambelt wasn't done recently I would suggest to change water pump, cambelt and tensioner together with thermostat. Last edited by notorious; 23rd October 2010 at 02:39 PM.
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#7
17th November 2010, 04:14 PM
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Is it a problem driving with a thermostat like the one described before fixed? Mine does the same thing but im waiting for cambelt change - 140k. So another 40k to do is that the recommended changing time?
__________________
___________ Kunwar 2002 Audi S8
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#8
17th November 2010, 08:41 PM
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Check out the maintenance schedule here for your particular engine / year Kunwar
__________________
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 November 2010, 08:04 AM
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Hi,
Thanks for that According to that schedule it says change timing belt at 105,000 miles? I think there is something not right with that page as every car is showing as having to do it at 105k! The cam belt change was done by Audi at roughly the 70,000 mile mark! Surely that can't be right? I'm sure it 70k or so between each timing belt change - I just spoke to Ben and he says its every 6 years or 80k.
__________________
___________ Kunwar 2002 Audi S8
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#10
18th November 2010, 12:20 PM
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Audi says 120k km so around 75k miles
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Linear Mode
