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
REMOVAL AND INSTALLATION

Vacuum Control Motors

The vacuum control motors (18A318) for the PANEL/DEFROST and MIX damper doors are attached to the underside of the heater air plenum chamber (18471). The previous illustration titled Outside Air/Recirculated Air Door Vacuum Motor Installation shows these vacuum control motors disassembled from the heater air plenum chamber.

 

Windshield Defroster Door

Removal

  1. Remove the vacuum hose from the vacuum control motor.

  1. Remove the two screws that attach the vacuum control motor to the heater air plenum chamber.

  1. Rotate the assembly so the slot in the bracket is parallel with the tee-shaped end of the door crank arm. Carefully disengage motor link from pin on crank.

Installation

  1. Follow removal procedures in reverse order.

  1. Verify that the system functions properly.

 

Heater and A/C Inlet Duct Door

Removal

  1. Remove the heater outlet floor duct (18C433).

  1. Disconnect the two vacuum hoses from the vacuum control motor.

  1. Remove the two screws which secure the vacuum control motor and bracket assembly to the heater air plenum chamber.

  1. Using a small screwdriver, depress the tang on the side of the door operating lever and pull the arm out of the lever.

Installation

  1. Follow removal procedures in reverse order, sliding motor arm into door lever until locking tang engages.

  1. Verify that the system functions properly.