Removing and Installing/Replacing Coolant Thermostat

11 53 000 Removing and installing/replacing coolant thermostat (S63)





Warning!
Danger of scalding!
Only perform this work after engine has cooled down.





Recycling:
Catch and dispose of drained coolant in a suitable container.
Observe country-specific waste-disposal regulations.





Necessary preliminary tasks:
^ Drain coolant

^ Remove front underbody protection





Release plug connector (1) and pull off.

Unlock and detach coolant hose (2).

Unfasten nut.

Release screws.

Tightening torque 11 53 1AZ.

Remove coolant thermostat (3).





Note:
The coolant thermostat is integrated in the housing cap and can only be replaced as a complete unit.

Clean sealing surfaces.

Installation:
Replace sealing ring (1).





Assemble engine.

Top up coolant.

Vent cooling system and check for water leaks.