Heater Control Valve: Service and Repair

64 11 273 Replacing Water Valve For Heating Unit







WARNING:
Scalding hazard.
Work on the cooling system may only be carried out when it has cooled down.
Follow instructions for working on cooling system.







NOTE: Clamp off coolant hoses on water valve.







Recycling
Coolant emerges when coolant lines are detached. Have a suitable collecting container ready.
Catch and dispose of escaping coolant.
Observe country-specific waste disposal regulations.







Necessary preliminary tasks:
N54 Only:
- Remove both blow-off valves

N63 only:
- Remove intake silencer housing
- Remove coolant expansion tank







NOTE: Engine is shown removed for purposes of clarity.

Disconnect plug connection (1).
Release hose clamps (2, 3) and detach coolant hoses.

Installation:
Do not mix up connections of coolant hoses.
Replace damaged coolant hoses.







Installation:
To avoid the buildup of noise, make sure that the rubber mounts (1) on the water valve are securely seated in the mounting on the frame side member (2).







After installation:
- Fill and vent cooling system and check for leaks