17 11 100 Removing and installing/replacing coolant expansion tank (N55)

Necessary preliminary tasks :

Unlock and detach coolant hose (1) from top of expansion tank.

Release screw (2).

Tightening torque: 17 10 5AZ .

Unlock locks (3) in direction of arrow. Pull off expansion tank upwards from carrier support until coolant hose below expansion tank is accessible.

Fig 1: Detaching Coolant Hose From Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock and disconnect plug on coolant level switch (1).

Unlock and detach coolant hose (2).

Lift out expansion tank.

Fig 2: Coolant Hoses

Courtesy of BMW OF NORTH AMERICA, INC.

Check coolant level, top up coolant if necessary.