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Air control knob

(1999 Ford Expedition)
in Middletown, OH on June 24, 2011
Control knob allows air/heat to blow on high setting but does not work on medium or other settings, only on "high".
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Popular Answer
on June 24, 2011
Usually this means the blower motor resistor has failed And its available at Napa Auto Parts But I see 2 different styles and you can find a shop to change this here The part runs from $22 to $80 at
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