Heater Control Valve: Service and Repair

64 11 273 Replacing Water Valve For Heater (N54, N55)







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







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:
- Remove rear left charge-air duct







NOTE: Picture shows engine removed for purposes of clarity

Release hose clamps (1) and detach coolant hoses.
Disconnect plug connection (2).
Pull water valve (3) upwards out of holders.

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







Installation:
Make sure rubber mount (1) and guide lug (2) are securely seated in holders (3) on wheel arch body.







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