17 11 100 Removing and installing/replacing coolant expansion tank (N53, N54)
WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks:
- Drain coolant from radiator.
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.
Vent cooling system and check for leaks.