17 11 100 Removing and installing/replacing coolant expansion tank (N46, N45, N52, N52K, N51, N53)

Necessary preliminary tasks: 

• Drain Coolant From Radiator 

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

Release and disconnect coolant hoses (2).

Release bolts.

For tightening torque refer to 17 11 3AZ in 17 11 RADIATOR AND MOUNTING PARTS .

Remove coolant expansion tank (3).

Installation: 

Insert locating pin in rubber grommet.

Fig 1: Removing Coolant Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

Check cooling system for Leaks .