17 11 100 Removing and installing/replacing coolant expansion tank (S63 B44 T 0)

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2018 BMW M6, 2018 BMW 650i xDrive, 2018 BMW 650i, 2018 BMW 640i xDrive, and 2018 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Drain COOLANT .
Remove WHEEL ARCH COVER (REAR SECTION) front left

Release screws (1).

Tightening torque 17 10 2AZ .

Unlock connector (1) on coolant level switch and disconnect.

Fig 1: Identifying Screw And Connector On Coolant Level Switch

Courtesy of BMW OF NORTH AMERICA, INC.

Pull expansion tank (1) forward.

Release and disconnect coolant hoses (2).

Unlock and disconnect coolant hoses (3).

Feed expansion tank (1) forward and remove.

Fig 2: Identifying Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

Check cooling system for LEAK TIGHTNESS .