1998 aud A6 2.4 Can you tell me where the thermostat goes? poss with a diagram

Get a compression test done to eliminate a warped head or cracked head . Hopefully you have not cracked the block as this costs 6000 dollars AUD to fix or $3500 AUD for a Reco Engine.
If it is an alloy head the two metals cool at different rates and warping or cracking can occur. $$$$$$$ costly $$$$$$ to fix

If u have a 2.2L, I have the same car and just replaced the thermostat and it took 10 times longer to find it than to replace it!!! There is a "Thermostat Housing" on the engine itself, front of motor, left side but IT DOESN'T GO THERE!!! There is a 2-Bold, 2 or 3 hose, bracket out in front, very accessible that it goes in!! I found mine just searching diagrams of chevy cavalier's and found it in a 03'!!! The place it goes comes off of the "Thermostat Housing" and runs right up front of the car, left side!!! Hope this helps some!!!!

check the timing belt and the timing.check thermostat is installed correctly, do not trust the guy that fixed the other problems. there is no such thing as an [internal leak?] go to another guy.lol.

that all depends where the leak it, so yes it is poss.

The serpentine belt diagram for 2001 aud A6 Quattro 2.8 liters V6 engine:


CS = Crankshaft
F = Fan pulley
Gen = Alternator
T = Tensioner
AC = Air Conditioning
PAS = Power Assisted Steering

Most of the time a thermostat is located where the radiator hose goes into the engine block on top of thr engine not underneath the radiator.

did u bleed the air from the cooling system? if not u need to do that, u have air pockets getting around the thermostat, to bleed raise the front up as high as poss with a floor jack, fill the radiator and coolant recovery tank as full as poss, then run engine until it reaches normal temp, then shut it down and run cold water over the radiator,this will draw the coolant out and the system will bleed the air out.

spring side of the thermostat goes to engine side.

it sound like the thermostat
check upper rad hose at the eng.the therm.is there

Sounds like your thermostat may be stuck open. You will be able to look at it and tell upon removal.