Necessary preliminary work

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Drain COOLANT .
Remove left TRAILING LINK .
Remove left intake duct.
Release EXPANSION TANK for hydraulic steering or dynamic drive and place to one side.

Release screw (1).

Tightening torque 17 10 2AZ .

Release and disconnect coolant hoses (2).

Raise expansion tank (3)

Fig 1: Identifying Coolant Expansion Tank With Hoses And Mounting Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove expansion tank (2).

Fig 2: Identifying Coolant Expansion Tank With Coolant Level Switch Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

Check cooling system for LEAK TIGHTNESS .