Question about 2002 Ford Explorer

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The heat in my 02 explorer is working. When I turn it on, a knocking noise starts.

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  • Ford Master
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Sounds like something in the fan. If you turn the fan speed up, does the knocking speed increase? If so, pull the fan, maybe soemthing came loose or stick in it.
If speed does not change, you may have an air direction door issue. You just need to investigate. Surgery to air boxes is fragile and difficult, you may want to have a shop do this for you...

Posted on Nov 12, 2010

  • jimmy tharpe Dec 06, 2011

    It is the blend air door, I just replaced one it was doing the same thing. The little plastic gears inside are stripped and the door is spring loaded, it will begin to open the door then when it hits the bad section of the gear it slams shut, giving you the knocking noise.

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