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Low on coolant, stuck open thermostat, plugged heater core, faulty temperature blend door,

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Q: Why will a car heater blow out cold air when heater is on?
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You are low on coolant to the heater core.


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Could be the Climate Control Unit or Clogged heater core.


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What causes the heater to blow cold air when the engine is overheating on a 1999 Cadillac Seville?

Low coolant. If the coolant is low then the heater core is not able to transfer heat in to the car.


Why does your heater blow out cold air?

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Will a cracked head gasket on a 1996 Subaru Legacy L 2.2L cause the car to overheat and the heater to blow out cold air also?

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