Air Bleeder Screw: Locations

Separate expansion tank
No bleed screws on radiator and thermostat housing!
All bleeding occurs through the vent pipe which leads to the connection on the expansion tank.
Coolant system is vented during the filling procedure.





Integrated expansion tank
Unfasten vent screw on expansion tank.
All bleeding occurs through vent plug on expansion tank. Cooling system is vented after the filling procedure.





On vehicles with M52 engines, also unfasten additional vent screw.