Hi Peter,

Mother Volvo didn't include an air bleeder screw or other feature that is seen on some other makes/models. The system is design such that it isn't needed. Furthermore there's no need to turn on the in-cabin heater during a coolant flush; there's no heater valve. The coolant runs through the heater core constantly, an air flapper valve controls the flow of air over the core and into the cabin.

The procedure for filling the cooling system consists of filling the reservoir to the MAX level (squeezing the upper radiator hose to induce some "burping" helps get more in the system), running the car until it reaches operating temperature (thermostat open), then allowing it to cool. Finally, top off the reservoir as needed.

The reservoir is also known as an expansion tank. It's normal for the coolant level to rise when the system is pressurized (hot) and fall when it is cool.

-Will
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XC60 / Odyssey