Necessary preliminary work

Drain COOLANT .
Remove COOLANT PUMP .
Remove charge air cooler EXPANSION TANK .
REMOVE fan cowl with electric fan.

IMPORTANT: Risk of damage!
Coolant emerges when the coolant hoses are detached from the coolant thermostat.
Cover surrounding components and plug connections with suitable apparatus

NOTE: For purposes of clarity, the graphic shows the auxiliary water pump removed.

Fig 1: Identifying Plug Connection, Coolant Hose And Coolant Thermostat

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect plug connection (3).

Installation note:

Plug connection (3) must snap audibly into place!

Unlock snap fastener on coolant hose (2).

Detach coolant hose (2) and lay to one side.

NOTE: One of the screws is not shown and is located at the rear under the coolant thermostat (1).

Release screws (4).

Tightening torque 11 53 1AZ .

Lift out coolant thermostat (1).

NOTE: The coolant thermostat is integrated in the housing cover. It can only be replaced as a complete unit!

Clean sealing surface.

Installation note: