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

WARNING: This page is about a different car, the 2011 BMW X6 and 2010 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: High-voltage system - danger to life!

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

WARNING: The following points must be strictly observed prior to starting work:

DE-ENERGIZE THE HIGH-VOLTAGE SYSTEM
Observe SAFETY INSTRUCTIONS for handling with hybrid vehicles

Necessary preliminary tasks:

Remove COVER from electronics box power module
Disconnect BATTERY NEGATIVE LEAD
Follow INSTRUCTIONS FOR WORKING on cooling system.
Drain COOLANT from radiator down to lower edge on expansion tank.

Unscrew nuts (1).

Tightening torque 12 42 1AZ .

Tightening torque 12 42 2AZ .

Release earth cable (2) and lay to one side.

Release positive battery cable (3) and lay to one side.

Fig 1: Identifying Positive Battery Cable, Earth Cable And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

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 2: 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 3: Identifying Plug, Lower Coolant Hose And Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.

Check COOLING SYSTEM for leaks.