My sister car honda civic 2001model .When
she tune on the heater it's start overheating
when it's off doesn't overheat any help on
this thanks in advance .
make sure the coolant level is full. if it is then their might be air in the system and it will need to be burped
Coolant leave is full . If she didn't switch to on position the heart doesn't overheating.the moment she switch to on position the heater and start overheating thank you .
Did you bleed air out the system like Mike mentioned? If you did you might have a faulty heater control valve or the heater core itself is blocked. Let us know what you find.
Thanks so much helpful answers. I bleed air out from coolant system. Car run perfect no more over heat .am so happy thanks once again .
Glad to help.
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