Coolant Leak on 2.7 Twin Turbo

[Ted Haug]

Hey there Ti,
A friend has an '01 S4 with the 2.7, and he had similar problem.  Mysterious coolant leaks upon shut down.  It proved to be the plastic thermostat housing was failing.  For somesilly reason Audi thought plastic was a good idea on the 2.7 for the housing.  The early 2.8 liter normally aspirated engines used an aluminum housing which rarely fails.  We went to the local pick and pull and got a thermostat housing from an early normally aspirated car, and installed it on the 2.7....and no more leaks.  Definitely might want to check there first...housing is mountedon the front of the engine toward the passenger side head.
Hope this helps.
Ted H.1982 4000 4E1986 Coupe GT1990 V8 quattro