11 53 000 Removing and installing/replacing coolant thermostat (N55)
Only perform these tasks on an engine that has cooled down.
Danger of injury!
Risk of skidding due to coolant on the floor.
Recycling:
Catch and dispose of drained coolant in a suitable collecting vessel.
Observe country-specific waste disposal regulations.
Protect plug connections against coolant and dirt contamination.
Cover plug connections with suitable materials.
Necessary preliminary tasks:
- Remove underbody protection. See FRONT UNDERBODY PROTECTION or FRONT UNDERBODY PROTECTION (AWD) .
- E70, E71:
Remove reinforcement plate.
- E82, E84, E88, E90, E91, E92, E93, F25:
Remove CHARGE AIR COOLER .
- Remove FAN COWL .
- Place oil drip tray for coolant under engine compartment.
Disconnect coolant hoses (arrows) on the thermostat (1) with clamping tongs.
Release hose clamp (1) and detach coolant hose.
Release hose clamp (2) and detach coolant hose.
Unlock and detach coolant hose (3).
Unlock and detach coolant hose (4).
Disconnect plug connection (5).
Release screws (6).
Tightening torque 11 53 1AZ .
Remove coolant thermostat (7).
Assemble engine.
Observe CAPACITIES .
Installation note:
Check coolant hoses for cracks and damage.
Renew coolant hoses as required.
Recommendation:
On vehicles older than five years, renew coolant hoses.
Check function of cooling system.