the blend door actuators only control hot or cold. nothing to do with speed of air flow.
if your def, vent, floor setting are not working right chances are you have a broken vac line to one of the vac pumps that do move the air from setting to setting.
or theres a rats nest in the air box blocking it up. long shot there lol
the round thing with the tube off the top and the arm leading up, it is the vac pump in this pic
same thing on the other side.
this vac tube runs out the pass side fender around the battery across the bumper, then to a round ball in the d/s fender.
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