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

Heater Core

Removal

  1. Allow the engine to cool. Observe the safety precautions in Section 03-03.

  1. Place a thick cloth over the radiator cap. Turn the cap slowly to its first stop to release system pressure. When the pressure has been released, tighten the radiator cap.

  1. Disconnect the heater water hoses (18472) from the heater core (18476). Plug the hoses.

  1. Remove the glove compartment.

  1. From inside the passenger compartment, remove the seven screws that attach the heater core cover (18B300) to the heater air plenum chamber (18471).

  1. Disconnect the vacuum source. Leave the A/C plenum vacuum harness (18C581) attached to the heater core cover. Remove the heater core cover.

  1. Remove the heater core from the heater air plenum chamber.

Installation

  1. Position the heater core and heater core case seal (18658) in the heater air plenum chamber.

  1. Install the heater core cover on the heater air plenum chamber and secure it with its seven attaching screws. Make sure the A/C plenum vacuum harness is not trapped or pinched during the installation.

  1. Connect the A/C plenum vacuum harness to its source connection.

  1. Install heater water hoses on the heater core at dash panel (01610) in engine compartment. Do not overtighten the clamps.

  1. Check coolant level and add coolant as required. Refer to Section 03-03.

  1. Check system for proper operation and coolant leaks.

  1. Install glove compartment.

  1. Check system for proper operation.






    ItemPart NumberDescription
    118B300Heater Core Cover
    218476Heater Core
    3—Heater Core Tubes (Part of 18476)
    418596Heater Core Tube to Cowl Gasket
    518471Heater Air Plenum Chamber
    618A318Vacuum Control Motor (Floor/Defrost)