17 11 100 Removing and installing/replacing coolant expansion tank (N63, S63)

WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. 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) slightly until plug for coolant level switch and lower coolant hose are accessible. Unclip line on side of expansion tank.

Installation:

Make sure expansion tank is in correct installation position.
Tightening torque 17 10 1AZ .

Fig 1: Locating Coolant Expansion Tank Mounting Screws
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 Expansion Tank, Lower Coolant Hose And Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Vent COOLING SYSTEM .

Check COOLING SYSTEM for leaks.