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Could be a stuck open thermostat or low on coolant or the temperature blend door is faulty.

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Q: Why does your car blow cold air instead of hot air when used?
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Related questions

What causes a cars heater to blow cold air?

THE CAUSE for this is that when your cold air is on the petrol is used to create air. and that is how cars create cold air

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if it's the outside unit, it will always be hot air. that's the air being pulled out of the house. cold air in, hot air out.

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Why does the heater in my 1995 De Ville blow cold air instead of hot air?

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