Car Heater Blowing Cold Air

My heater blows hot air for 3 seconds then cold air, why? The blower works good and the AC works perfectly, but not my heater.

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December 10, 20160 found this helpful
Best Answer

Check the hose connections in the engine to the heater, from the back of the dashboard, they may be loose.

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December 27, 20160 found this helpful
Best Answer

Check the thermostat and does it have enough antifreeze/coolant?

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December 15, 20160 found this helpful

You may to replace the thermostat. Many automotive stores will scan for free. Auto zone will do this as well as advance auto.

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December 30, 20160 found this helpful

You could have a clogged heater core.

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