Air trapped when refilled the cooling system. Is the diverter valve to the heater working? Is it visible in the engine bay or buried in the dash.
Could be Not sure No idea
What does it look like?
Not sure on your car, I'll Google and see what I can find.
You did have the heater on full when you refilled the system.
Did it work before the pump change.
@Light_EDDed started
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Air trapped when refilled the cooling system. Is the diverter valve to the heater working? Is it visible in the engine bay or buried in the dash.