11 53 000 Removing and installing/replacing coolant thermostat (S63)

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WARNING: Risk of scalding!
Only perform this work after engine has cooled down.

Recycling:

Catch and dispose of drained coolant in a suitable container.

Observe country-specific waste disposal regulations.

Necessary preliminary tasks:

Remove COOLANT PUMP .

Unlock plug connection (1) and pull off.

Unlock and detach coolant hose (2).

Unfasten nut.

Loosen screws.

Tightening torque 11 53 1AZ .

Remove coolant thermostat (3).

Fig 1: Locating Coolant Thermostat Screws

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: The coolant thermostat is integrated in the housing cap and can only be replaced as a complete unit.

Clean sealing surfaces.

Installation note:

Replace sealing ring (1).

Fig 2: Identifying Coolant Thermostat Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

Vent COOLING SYSTEM and check for water leaks.