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

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โˆ™ 2011-12-31 20:50:23
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Q: When you turn heat on in car it goes between hot and cold air is it the thermostat?
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What could be wrong if your 2002 alero's heater air is warm-- then goes cold--then the thermostat goes up and then the heat is warm again and the thermostat goes back down?

Souns like a head gasket to me.

Why is your heat blowing out cold air?

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What is the principle of thermostat?

The principle of a thermostat is to regulate heat or cold air. Thermostats can be used for rooms, people, or cooking.

What happens when thermostat goes out?

If it's stuck open, no heat. If it's stuck closed, over heat.

What happens when your thermostat goes bad?

When a thermostat goes bad in a vehicle, it can make your car overheat. It can also make it t where you do not have any heat inside your car.

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Yes, and it can also make your car to over heat

What are the differences between heat and temperature?

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The engine is overheating and you have no heat just cold air blowing?

Probably a bad thermostat.

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