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

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2018 BMW M6, 2018 BMW 650i xDrive, 2018 BMW 650i, 2018 BMW 640i xDrive, and 2018 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.

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.