11 53 000 Removing And Installing/Replacing Coolant Thermostat (N73)

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WARNING: Danger of scalding! Only perform this task on an engine that has cooled down.

Recycling:

Catch and dispose of coolant.

Observe country-specific waste-disposal regulations.

Necessary Preliminary Tasks:

Remove assembly underguard at front.
Remove coolant drain plug on radiator. Refer to 17 00 005 DRAINING AND ADDING COOLANT (N73) .
Remove fan. Refer to 11 52 020 REMOVING AND INSTALLING OR REPLACING FAN CLUTCH (N73) .

Disconnect plug (1).

Disconnect water hose (2).

Release screws on coolant thermostat (3).

Remove coolant thermostat (3).

Illustrations show N62.

Fig 1: Locating Coolant Thermostat Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Clean sealing surfaces.

Replace sealing ring (1).

Installation:

Coolant thermostat is integrated in cover and can only be replaced as a complete unit.

Fig 2: Identifying Thermostat Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up coolant.

Vent cooling system and check for leaks. Refer to 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (N73) .