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

Special tools required:

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 collecting vessel.

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

Necessary preliminary tasks:

REMOVE front underbody protection.
Place collecting vessel for coolant under engine compartment.

Disconnect coolant hoses (arrows) from thermostat using grips.

Fig 1: Locating Coolant Hoses

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and detach coolant hose (1).

WARNING: Danger of injury! Only lock and unlock spring strap (2) with special tool 17 2 050 .

Lock hose clamp (2) on coolant thermostat with special tool 17 2 052 .

Detach coolant hose from thermostat.

Unlock and detach coolant hose (3).

Release hose clamp (4) and detach coolant hose.

Fig 2: Identifying Coolant Hose And Hose Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (5) and remove coolant thermostat.

Installation note:

Unlock spring band clamp (2) with special tool 17 2 051 .

Assemble engine.

FILL cooling system.

Observe FILLING 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.