Auxiliary Cabin Heater Control Valve: Service and Repair

64 12 577 - Replacing changeover valve for independent/auxiliary heater





Warning!
Danger of scalding!
Only perform the following tasks on an engine that has cooled down.
Follow instructions for working on cooling system 17 00 039 Venting and Filling Cooling System With Vacuum Filling Unit.





Note:
Clamp off coolant hoses from changeover valve for independent/auxiliary heater.





Necessary preliminary tasks:
- Remove front underbody protection Removing and Installing/Replacing Front Underbody Protection





Release bolts (1).
Remove lower left cover (2).





Note:
For purposes of clarity, picture shows component removed.

Important!
Risk of damage!
Observe marked coolant flow direction.

Note:
Mark position of coolant hoses prior to removal.

Release spring clamps (1) and detach coolant hoses.





Unfasten plug connection (1) and disconnect.
Release screws (2).
Remove changeover valve for independent/auxiliary heater (3).





After installation:
Top up coolant and vent cooling system 17 00 039 Venting and Filling Cooling System With Vacuum Filling Unit.