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Re: Audi 4000CS Quattro thermostat

Are you trying to locate the thermostat?

It should be on the right side of the radiator fan, towards the bottom end of it.
There should be a thermoswitch wire leading to it.  Unhook the wire, and remove the
thermostat with a socket/wrench (I am not sure what size, but I had to rent truck size
tools from my hardware rental store to remove the damn thing).  A replacement thermo
is availiable from the dealer for about $30. 

Refitting is reverse of removal.

P.S: drain the coolant before starting this proceedure

hope that helps

Mine was an 1986 AUDI 5000 Turbo CS