Thermostat: Service and Repair

11 53 000 Removing and installing/replacing coolant thermostat (N12)

Special tools required:







WARNING:
Risk of scalding.
Only perform these tasks on an engine that has cooled down.
Danger of injury.
Risk of slipping due to coolant on the floor.







Recycling:
Catch and dispose of drained coolant.
Observe country-specific waste disposal regulations.

IMPORTANT:
Read and comply with General Information.
Protect plug connections against coolant and contamination.
Cover plug connections with suitable materials.







Necessary preliminary tasks:
- Drain coolant from radiator.







Release lock (1) on coolant pipe in direction of arrow.







Disconnect plug connection (1) on coolant thermostat.







Detach all coolant hoses from thermostat.

NOTE: Release metal pipe clips using special tool 17 2 050.

Disconnect plug connection (1) on coolant temperature sensor.
Slacken nut (2).
Release screws (3).
Tightening torque: 11 53 1AZ.







Installation note:
Replace gasket (1).







Assemble engine.
Fill cooling system and check for tightness.