BLEEDING COOLING SYSTEM
Turn rotary control to "warm".
Loosen bleeder screw at operating temperature.
Let engine run at high idle speed until coolant
running out is without air bubbles.
Add water to expansion tank continuously during
bleeding procedures.

63017031 - click to zoom
 
Vehicles after change point in 1982
BLEEDING COOLING SYSTEM
Requirements:
Engine at operating temperature.
Heater set to "WARM".
Engine running at fast idle speed.

63017008 - click to zoom
 
Loosen bleeder screw and tighten again when escaping coolant is without air
bubbles.
Keep expansion tank full while bleeding.
See Service Information of Group 00 for coolant specifications.

63317010 - click to zoom
 
Mark on expansion tank shows the full level for cold coolant (approx. 20° C/68° F).
BMW M 635 CSi:
The cooling system of this model is bled automatically.

63017047 - click to zoom