Fill and vent the low-temperature coolant circuit

NOTE: TECHNICAL INFORMATION 
It is mandatory  to fill the cooling system before bleeding.
Fill both  the circuits for high and low-temperature coolant circuits.

• See VENT THE COOLING SYSTEM AND CHECKING FOR WATERTIGHTNESS WITH THE SPECIAL TOOL (LOW-TEMPERATURE COOLANT CIRCUIT) .

Courtesy of BMW OF NORTH AMERICA, INC.