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Where is the actuator door located for the heat control

(1999 Ford F-150)
in Shelbyville, TN on October 03, 2015
I have no heat ever
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Popular Answer
on October 03, 2015
temp. hand in normal range? when you are sitting in the truck,windows up,real quiet,turn key to ON,NOT START.turn cold/hot knob back and forth should hear a humming noise if the actuator is switching from hot to cold,turning it slowing.LISTEN CLOSELY.if you don't hear the little motor humming when switching from hot to cold,then the blend door actuator at the bottom center floor of dash,behind black cover is bad.
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Even if i set all the controls and temps as cold as possible.
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