Coolant Reservoir: Service and Repair

17 11 100 Removing and installing/replacing coolant expansion tank (N63, S63)





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





Necessary preliminary tasks:
^ Follow instructions for working on cooling system
^ Drain coolant from radiator down to lower edge on expansion tank





Unlock and detach coolant hose (1).

Release screws.

Raise coolant expansion tank (2) slightly until plug for coolant level switch and lower coolant hose are accessible. Unclip line on side of expansion tank.

Installation:
^ Make sure expansion tank is in correct installation position.
^ Tightening torque 17 10 1AZ.





Unlock plug (1) and remove.

Unlock and detach lower coolant hose (2).

Remove expansion tank (3).





Reassemble the vehicle.

Vent cooling system.

Check cooling system for leaks.