Volvo coolant circuit in water heater


I just got the anode changed in the water heater on my S.M. Now the Volvo doesn't heat the water, and it seems to have too much coolant in spite of the spillage during reinstallation of the water heater. Obviously, I have a large amount of air in the circuit.
What is the easiest and most appropriate way to remove this air?
Thanks. Bill on S/V Lady Sadie
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