The thermostat is located on the passenger side of the engine, behind the timing belt.
plk[
The thermostat is electronically controlled, and if faulty will set off the cel. it is located on the drivers side of the engine block, directly beneath the intake manifold.
how do you replace the thermostat on Audi A-6 year 1998 model quadro. 2.8 cilinders
It is located on the lower right hand of the radiator if you are facing the front of the car. It is expensive and difficult to change
Front of the engine just behind the radiator. Not an easy job for the lay-mechanic.
Follow the top radiator hose down to the water outlet. The stat is in there. I hope this helps you. Mark
behind timing belt very$$$$$
behind cam belt tension pulley
Where is the crank shaft sensor located in a Audi a6
http://www.audizine.com/forum/showthread.php?t=189157
I don't know if there is a difference but in my 2006 Audi S4, it is located in the trunk.
Under the intake manifold next to the orange dipstick tube. on the 1.8t that is.