by p69chico on December 17th, 2008

p69chico

Question

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The heater core heats up, but it won't blow any hot air? We just replaced the heater core and the heater box is nice and warm but only cold air comes out of all the vents. What's wrong with it?

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Answers. 1 helpful answer below.

  • by Ms.A on December 17th, 2008

    Ms.A

    It's the blend door.Make sure both hoses to the heater core are hot.You can thank my husband :)

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