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well you could just turn the heater off heater blower

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If it is a car heater then check your coolant level. the heater is driven off a heat converter that is fed by the radiator system. When the coolant fails to pump round the radiator system the car internal heater doesn't work. Driving without coolant in the system will result in the engine overheating and seizing.

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Q: What can cause a heater to stop blowing heat?
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