17 11 100 Removing and installing/replacing coolant expansion tank (N62TU/N52K/N54)

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

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

Necessary preliminary tasks:

Follow instructions for working on cooling system.
Drain coolant from radiator down to lower edge on expansion tank.

Unlock and detach coolant hose (1).

Release screws.

Raise coolant expansion tank (2) until plug for coolant level switch and lower coolant hose are accessible.

Installation:

Make sure expansion tank is in correct installation position.
Tightening torque 17 10 2AZ , see 17 10 RADIATOR, EXPANSION TANK, LINES (N62TU, N52K, M57T2) . Applies to N54 engine.

Fig 1: Identifying Coolant Hose And Coolant Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug (1) and remove.

Unlock and detach lower coolant hose (2).

Remove expansion tank (3).

Fig 2: Identifying Lower Coolant Hose And Expansion Tank With Plug

Courtesy of BMW OF NORTH AMERICA, INC.