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

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 128i, and 2009 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Drain coolant from radiator

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

Release and disconnect coolant hoses (2).

Release bolts.

Tightening torque 17 11 3AZ, see ENGINE RADIATOR .

Remove coolant expansion tank (3).

Installation:

Insert locating pin in rubber grommet.

Fig 1: Identifying Coolant Expansion Tank, Coolant Hoses And Coolant Level Switch

Courtesy of BMW OF NORTH AMERICA, INC.

Check cooling system for leaks .