just make sure the heating control is set to max. heat temperature so that the heater can be bled of air.
Is this really necessary anymore?
On many cars air temperature is no longer controlled by restricting the water flow through the matrix, as was usual many years ago.
Nowadays, many cars have full flow through the matrix at all times and temperature control is achieved through use of flaps to direct airflow either through the matrix or around it (or somewhere in between).
It's probably still sensible to do though if there's any uncertainty over which method a particular vehicle employs.
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