Thermostat: Service and Repair

11 53 000 - Removing and installing/replacing coolant thermostat (M52TU/M54/M56)

Remove fan clutch with fan impeller and fan cowl.





Drain and dispose of coolant.

Note:
The water drain plug is located on the exhaust side on cylinder 2 in the engine block.

Installation:
Replacing sealing ring on water drain plug.
Tightening torque 11 11 5AZ 11 11 Engine Block.
Vent cooling system and check for leaks.





Pull locks and disconnect water hoses.

Installation:
Refer to general instructions for work on cooling system 17 00 ... Instructions For Working on Cooling System.





Loosen nut (1).
Release screws on thermostat housing, remove thermostat housing.





Installation:
Keep sealing faces clean and free of oil.





Note:
Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit.

Installation:
Replace seal (1).