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My 2003 Ford Explorer and my heat does not work I turn it on but it only blows cold air. Also when I take it off cold to turn the heat up it's starts making a ticking sound like something is knocking? What is this problem? When I turn it back to the air, the ticking noise stops.

This is the exact same thing on my 04 explorer, Does anyone have an answer?

You need a Blend Door Actuator.. They are fairly cheap at Autozone or Advanced Auto Parts. The hard part is getting to the blend door. You have to remove a section of your dash. The actuator is located on the drivers side where your right leg would be if you were sitting in the vehicle. I wouldn't pay to have it done. I just replaced mine. You just have to be patient and remove one bolt at a time until you reach it. hope this helps!

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