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

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 BMW 740i, 2015 BMW 740Li xDrive, 2015 BMW 740Li, 2014 BMW 740i, and 2014 BMW 740Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work:

Follow INSTRUCTIONS FOR REPAIR WORK ON THE COOLING SYSTEM .
Only for vehicles with the Dynamic Drive:
Remove left TRAILING LINK .
Remove INTAKE PORT .
Release EXPANSION TANK for Dynamic Drive and place to one side.

Release screw (1).

Tightening torque 17 10 3AZ .

Clamp off coolant hoses (2) with a suitable tool.

Release and disconnect coolant hoses (2).

Raise expansion tank (3)

Fig 1: Identifying Coolant Hoses, Expansion Tank And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

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

Remove expansion tank (2).

Fig 2: Identifying Expansion Tank And Connector

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

Check cooling system for LEAK TIGHTNESS .