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 ... Instructions For Working on Cooling System.





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





Necessary preliminary tasks:
- Remove front left wheel arch trim 51 71 039 Removing and Installing/Replacing Front Left or Right Wheel Arch Cover (Rear Section)





Important!
Risk of damage!
Observe coolant through-flow direction, mark coolant hoses before removing.

Note:
If necessary, catch escaping coolant.

Disconnect plug connection (1).

Release spring clamps (2) and detach coolant hoses.
Release nuts (3) and remove changeover valve for independent/auxiliary heater (4).





After installation:
Vent cooling system and check for water leaks 17 00 039 Venting Cooling System and Checking For Water Leaks