Audi Workshop Service and Repair Manuals

Removing and installing thermostat housing with coolant pipe (rear) Special tools and workshop equipment required

t  Hose clip pliers -VAS 6362-

t  Assembly tool -T10118-

Removing –  Drain coolant → Chapter. –  Remove air cleaner housing → Rep. gr.24. –  Remove supercharger → Chapter. –  Remove coolant pipe (left-side) → Chapter.

–  Detach noise insulation -1- for charge air system.

–  Release hose clips -arrows- and disconnect coolant hoses from thermostat housing.

–  Using assembly tool -T10118-, unplug electrical connector -arrow- at oil pressure switch -F1-.

–  Unplug electrical connector -1- at coolant temperature sender -G62-.   Note Disregard -item 2-.

–  Remove bolts -arrows- for thermostat housing.   Note

For illustration purposes, the installation position is shown with the thermostat housing removed. –  Pull out retaining clip -arrow- for coolant pipe. –  Detach thermostat housing from coolant pipe.

–  Pull thermostat housing slightly towards front. –  Mark position of coolant hoses on thermostat housing for re-installation, release hose clips -arrows- and detach coolant hoses.

Release hose clip -arrow- and disconnect coolant hose from rear coolant pipe.

–  Detach coolant pipe -1- (rear) from cylinder block -3-. –  Detach O-ring -2-. Installing Installation is carried out in the reverse order; note the following: l  Tightening torques → Chapter „Thermostat housing - exploded view“   Note t  Renew seals and O-rings. t  Secure all hose connections with the correct type of hose clips (same as original equipment) → Electronic parts catalogue. –  Clean and smoothen sealing surface for O-ring. –  Lubricate O-ring with coolant. –  Attach coolant hoses to thermostat housing according to markings made during removal.

–  After securing thermostat housing, move coolant pipe up against housing as far as stop and only then insert retaining clip -arrow-. –  Check that coolant pipe is firmly secured in thermostat housing. Remaining installation steps are carried out in reverse sequence; note the following: –  Install coolant pipe (left-side) → Chapter. –  Install supercharger → Chapter. –  Install air cleaner housing → Rep. gr.24. –  Fill up with coolant → Anchor.