17 11 100 Removing and installing/replacing coolant expansion tank (N53, N54)

Necessary preliminary tasks:

N54: Unclip vacuum hoses.

Unlock and detach coolant hose (1).

Release screws (2).

Tightening torque 17 11 3AZ, see ENGINE RADIATOR

Raise expansion tank (3) slightly until plugs on coolant level switch and lower coolant hose are accessible.

Unlock plugs on coolant level switch and lower coolant hose and disconnect.

Remove coolant expansion tank (3).

Installation:

Insert locating pin in rubber grommet.

Fig 1: Identifying Coolant Hose And Coolant Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Vent cooling system and check for leaks.