17 11 100 Removing and installing/replacing coolant expansion tank (M54)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2008 BMW Z4, 2007 BMW Z4, 2006 BMW Z4, 2005 BMW Z4, and 2004 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Danger of scalding!
Only perform this work after engine has cooled down.

Necessary preliminary tasks:

Follow instructions for working on cooling system . See 17 00... Instructions For Working On Cooling System.
E85: Remove radiator cover See Removing Radiator Cover .
Remove fan cowl . See 17 11 031 Removing And Installing/Replacing Fan Cowl .
Draining coolant . See BMW Operating Fluids .

Unfasten plug connection (1) and disconnect.

Withdraw lock (2).

Fig 1: Disconnecting Plug Connection

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Pull locks (1 and 2) upwards and detach coolant hose from radiator/coolant expansion tank.

Fig 2: Detaching Coolant Hose From Radiator/Coolant Expansion Tank (1 Of 2)

Courtesy of BMW OF NORTH AMERICA, INC.

Pull lock (1) upwards and detach coolant hose from coolant expansion tank.

Fig 3: Detaching Coolant Hose From Radiator/Coolant Expansion Tank (2 Of 2)

Courtesy of BMW OF NORTH AMERICA, INC.

Illustration with radiator removed.

Pull coolant expansion tank upwards slightly out of carrier plate and pull out lower connection piece. Then tilt expansion tank to rear and remove.

Installation:

Check sealing rings. Do not under any circumstances coat sealing rings with antiseize agent before installation.

Retaining lug must engage in opening on carrier plate.

Fig 4: Identifying Retaining Lug Position

Courtesy of BMW OF NORTH AMERICA, INC.