I need a direction to go before i dig into this. I have a 99 F-150, standard cab with the V-6. I have a problem with the climate controls. The Fan Blower works in all speeds. The A/C works, and the Heat works. But no matter where i turn the far right knob(to tell it where to blow i.e floor, dashboard, vent etc...) it always comes out the defroster vents. It will blow A/C and heat, but it will only come out of the defroster regardless of setting. Any ideas.