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 2006 BMW X5, 2006 BMW X3, 2005 BMW X5, 2005 BMW X3, and 2004 BMW X5. 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 .
E85: Remove radiator cover
E83: Remove intake duct
Remove fan cowl, refer to 17 11 031 Replacing fan cowl (M62/M54)
Draining coolant, refer to 17 00 005 DRAINING OFF AND TOPPING UP COOLANT (M54)

Unfasten plug connection (1) and disconnect. Withdraw lock (2).

Fig 1: Unfastening Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

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

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 Coolant Expansion Tank

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.

Fig 4: Removing Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

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.