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

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 BMW 740i, 2015 BMW 740Li xDrive, 2015 BMW 740Li, 2014 BMW 740i, and 2014 BMW 740Li xDrive. 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 container.

IMPORTANT: Read and comply with GENERAL NOTES .

Protect plug connections against coolant and contamination.

Cover plug connections with suitable materials.

Necessary preliminary tasks:

Remove front UNDERBODY PROTECTION .
Drain COOLANT at the coolant pump
Place collecting vessel for coolant under engine compartment

Unlock and detach coolant hose (1).

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

Fig 1: Identifying Coolant Thermostat Coolant Hose, Spring Strap And Hose Clamp

Courtesy of BMW OF NORTH AMERICA, INC.

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.

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.