11 53 000 Removing and installing/replacing coolant thermostat (N54, N54T)

WARNING: Risk of scalding!
Only perform these tasks on an engine that has cooled down.
Danger of injury!
Risk of slipping due to coolant on the floor.

Recycling

Catch and dispose of drained coolant in a suitable container.

Observe country-specific waste disposal regulations.

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

Necessary preliminary work

Remove front UNDERBODY PROTECTION .
Except E71: REMOVE CHARGE AIR COOLER .
Except E60, E61, E71: remove FAN COWL .
Only E60, E61, E71: Remove reinforcement plate.

NOTE: Illustration shows coolant thermostat removed.

Disconnect coolant hoses (arrows) on the thermostat (1) with clamping tongs.

Fig 1: Identifying Coolant Hoses On Thermostat

Courtesy of BMW OF NORTH AMERICA, INC.

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 .

Fig 2: Identifying Coolant Hoses, Clamps, Connector, And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Remove coolant thermostat (7).

NOTE: Illustration shows coolant thermostat removed.

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.