17 11 100 Removing and installing/replacing coolant expansion tank (N53, N54, N54T)

Necessary preliminary tasks: 

• Drain coolant  from radiator. See 17 00 008 DRAINING AND ADDING COOLANT (N54, N54T) .

N54: Unclip vacuum hoses.

Unlock and detach coolant hose (1).

Undo screws (2).

Tightening torque: 17 11 3AZ .

Lift expansion tank (3) slightly until connector on the bottom of the coolant level switch and coolant hose is accessible.

Release and unplug connector on the bottom from coolant level switch and coolant hose.

Remove coolant expansion tank (3).

Installation note: 

Insert retaining pin in rubber grommet.

Vent cooling system  . See 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR WATERTIGHTNESS (N54)  or 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR WATERTIGHTNESS (N55)  and check for leaks.