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Heating AC and Engine Cooling

Why does the heat in a car alternate between hot and cold?


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There are many reasons that the cars heating system may alternate between blowing hot and cold air. Some common causes of this include the heater core and air pockets in the coolant.

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A car heater taps off engine heat. If you aren't driving, then the engine is cold and there's no heat for the car heater to use.

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well it could be because of the heat. if its cold out and you have the heat on in the car, then you will get hot and that will cause the window to fog.

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it maybe your heater core is going out recommend replacing it and go from there


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