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

Doors

 

A/C Air Temperature Control

The damper doors inside the heater air plenum chamber (18471) cannot be replaced. As a result, if there is a damaged MIX or PANEL/DEFROST door, the heater air plenum chamber, including these doors, must be replaced. The heater air plenum chamber must also be replaced if there is damage to the mounting studs that cannot be repaired.

 

Heater and A/C Inlet Duct

Removal

  1. Disconnect the electrical hardshell connector and remove the blower motor (18527).

  1. If only the vacuum control motor (18A318) is to be removed, disconnect the two screws which attach the vacuum control motor to the upper surface of the outside door duct.

  1. Pry the vacuum control motor and arm assembly upward at the arm end to free it from its mounting peg. A retaining flange which is an integral part of the crank, peg, and flange component may partially obstruct the arm in its upward movement along the peg. If this retaining flange should break off when forcing the arm upward, a 3/16-inch spring nut (Part No. 383358-S) must be used to retain the arm when the same or replacement vacuum control motor is installed. The illustration shows removal in Main View and the area in which retainer flange breakage might occur in View A.

  1. Look through opening in the case and use a screwdriver to depress the snap-on door crank while pulling up on door shaft to release the crank from the door.

  1. Remove the door through the opening.



    Outside Air/Recirculated Air Door Vacuum Motor Installation
     




    ItemPart NumberDescription
    1389915-S2Screw (2 Req'd)
    2—Motor Arm (Part of 18A318)
    3—Peg (Part of Cam)
    4—Retainer (Part of Cam)
    5—Electrical Wiring Harness
    (Part of 14401)
    618A318Vacuum Control Motor
    7383358-SSpring Nut


    Outside Air Door and Crank Removal




Installation

  1. Insert the door through the opening. Seat the bottom door pivot first, then swing the top door pivot into place.

  1. Hold the door in the full outside air position (swing to full in-board position) and snap in crank.

  1. Align the hole in the arm with peg in the door crank.

  1. NOTE: If the flange has been broken off, install the spring nut as described in Step 3 of the removal procedure.

    Slide the arm downward over the peg and along the inner surface of the retaining flange with the arm seats the base of the flange surface, and install retaining screws.

  1. Install blower motor in the housing and connect the electrical harness.