17 11 100 Removing and installing/renewing coolant expansion tank (N74)

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Necessary preliminary tasks:

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

Release screws (1).

Tightening torque: see 2AZ in 17 10 RADIATOR, EXPANSION TANK

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

Fig 1: Identifying Coolant Level Switch Plug And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

Pull expansion tank (1) forward.

Release and disconnect coolant hoses (2).

Release and disconnect coolant hoses (3).

Feed expansion tank (1) forward and remove.

Fig 2: Removing Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

Check cooling system for LEAKS .