Replace hose clamp (5)

Detach coolant hose (4) and lay to one side.

Release hose clamp (1) with a suitable tool.

Detach coolant hose (2) and lay to one side.

Disconnect plug connection (2).

Installation note: 

Plug connection (2) must snap audibly into place!

Lift out auxiliary water pump (1).

Release holder (3) from auxiliary water pump (1).

Fig 1: Identifying Plug Connection, Holder And Auxiliary Water Pump

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Top up COOLANT .

VENTING INSTRUCTIONS must be observed without fail.