17 11 100 Removing and installing/replacing coolant expansion tank (M54, N46)

WARNING: This page is about a different car, the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, and 2007 BMW X3. 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 .
E83: Remove intake duct
Remove fan cowl
Drain coolant, see 17 00 005 Draining and adding coolant (N52K) .

Unfasten plug connection (1) and disconnect.

Withdraw lock (2).

Fig 1: Disconnecting Plug Connection And Withdraw Lock

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Disconnecting Hose And Withdraw Lock

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 3: Pulling Lock 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.

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: Pulling Coolant Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.