11 53 000 Removing and installing/replacing coolant thermostat (N55)

Special tools required:

17 2 050

WARNING: Risk of scalding!
Only perform this work after engine has cooled down.
Danger of injury!
Use only special tool 17 2 050 to lock and release spring strap.

Recycling

Observe country-specific waste disposal regulations.

Catch and dispose of drained coolant in a suitable container.

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

Necessary preliminary tasks:

Drain COOLANT .
Remove FAN COWL .
REMOVE front underbody protection.
Place collecting vessel for coolant under engine compartment.

Unscrew bolt (1) and set expansion tank aside.

Fig 1: Identifying Expansion Tank Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1).

Loosen hose clamps (2), detach coolant hoses from thermostat.

Unlock quick-action lock (3) and detach coolant hose from thermostat.

Unlock quick-action lock (4) and detach thermostat from radiator.

Remove thermostat (5) toward the top.

Fig 2: Identifying Thermostat And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

FILL THE COOLING SYSTEM .

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.