Necessary preliminary tasks

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Drain COOLANT from radiator.

N54: Unclip vacuum hoses.

Unlock and detach coolant hose (1).

Undo screws (2).

Tightening torque 17 11 3AZ .

Lift expansion tank (3) slightly until connector on the bottom of the coolant level switch and coolant hose is accessible.

Release and unplug connector on the bottom from coolant level switch and coolant hose.

Fig 1: Identifying Coolant Hose, Screws And Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Remove coolant expansion tank (3).

Installation note:

Insert retaining pin in rubber grommet.

VENT COOLING SYSTEM and check for leaks.