Coolant Reservoir: Service and Repair

17 11 100 Removing and installing/replacing expansion tank for coolant (N54, N57) 740i, 730d, 740d





Necessary preliminary tasks:
^ Drain coolant.
^ Remove left tension strut.
^ Remove left intake duct.
^ Release expansion tank for power steering and place to one side.





Release screw (1).

Tightening torque 17 10 3AZ.

Release and disconnect coolant hoses (2).

Raise expansion tank (3)

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





Remove expansion tank (2).





Assemble engine.

Top up coolant.

Check cooling system for leaks.