behind timing belt very$$$$$
Follow the top radiator hose down to the water outlet. The stat is in there. I hope this helps you. Mark
how do you replace the thermostat on Audi A-6 year 1998 model quadro. 2.8 cilinders
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The thermostat is located on the passenger side of the engine, behind the timing belt.
behind cam belt tension pulley
at the compresser
http://www.audizine.com/forum/showthread.php?t=189157
In the most ridiculous spot going. Its in the front where the timing belt and rollers are. You need to take off the front bumper and remove the radiator to get at it. PITA to do.
Under the intake manifold next to the orange dipstick tube. on the 1.8t that is.
Thermostat is on the back of the cyl head up at the bulkhead, follow top rad hose back and you will find thermostat housing.
Thermostat failed in open position or radiator fan permanently on
you probably don't want to do it...you have to take off the front bumber just to get to it