Adding coolant
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.
Open vent screw (1).
Slowly fill coolant expansion tank up to lower edge of filler neck with RECOMMENDED COOLANT .
Observe MIXTURE RATIO .
Close vent screw (1) until bubble-free coolant emerges.
Have a cleaning cloth ready and mop up emerging coolant.
Close cap on expansion tank.