I've got a 1994 Mustang 3.8 and when I turn on the A/C or Vent, the air blows out where the defroster air should blow (top of dash on windshield). The defroster works fine, and the heater blows out on the floor, but I can't get air to blow out the vents where the A/C should normally blow out (directly at passengers).
What's the deal?