Thermostat: Service and Repair

11 53 000 - Removing and installing/replacing coolant thermostat (N73)





Warning!
Danger of scalding!
Only perform this task on an engine that has cooled down.





Recycling:
Catch and dispose of coolant.
Observe country-specific waste-disposal regulations.





Necessary preliminary tasks:
- Remove assembly underguard at front.
- Remove coolant drain plug Service and Repair on radiator.
- Remove fan Service and Repair.





Disconnect plug (1).
Disconnect water hose (2).
Release screws on coolant thermostat (3).
Remove coolant thermostat (3).
Illustrations show N62.





Clean sealing surfaces.
Replace sealing ring (1).

Installation Note:
Coolant thermostat is integrated in cover and can only be replaced as a complete unit.





Assemble engine.
Top up coolant.
Vent Venting Cooling System and Checking for Water Leaks cooling system and check for leaks.