Outside Air/Recirculated Air Door and Vacuum Control Motor
Section 12-03A: Air Conditioning System, Manual A/C-Heater | 1996 F-150, F-250, F-350, F-Super Duty and Bronco, F-Super Duty Motorhome Chassis Workshop Manual |
The outside air/recirculated air door is located in the A/C evaporator case (19897). It is operated by a vacuum control motor (18A318) in response to movement of the function air control knob (18519).
When the knob is in the NORM, A/C, VENT, FLOOR, MIX and DEFROST positions, the door is open to admit outside air; when the knob is in the OFF or MAX A/C position, the door is moved by vacuum to shut off outside air and open the passageway so that inside air can be recirculated through the system.
Outside Air/Recirculated Air Door and Vacuum Control Motor