The knob used to get stuck but now it turns freely but no change in air flow.
Ford F350 aircontrol knob works fine but it doesn't direct air/heat to the different places, floor, vent on front of dash, everything comes out at the defroster Thanks Keith
You need to check the control wire is`nt broken most likely come out from flap connection just reconnect and it will work again,check the flap affected for free movement as could be jamming.
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