Question about 1981 Ford Bronco

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Is the heater core on a 1981 bronco in the engine compartment or the cab compartment

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  • Ford Master
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In the cab, but procedures are different depending on whether or not you have A/C. See below

1980-81 Comfort Vent Heaters, Without Air Conditioning

  1. Disconnect the heater hoses from the heater core tubes and plug the hoses with suitable 5 / 8 inch; (16mm) plugs.
  2. Remove the glove compartment liner.
  3. Remove two (2) spring clips attaching the heater core cover to the plenum along the top edge of the heater core cover.
  4. Remove eight (8) screws attaching the heater core cover to the plenum and remove the cover.
  5. Remove the heater core from the plenum taking care not to spill coolant from the core.
To install:
  1. Install the heater core in the plenum.
  2. Install the heater core cover (eight (8) screws and two (2) spring clips along the top edge of the cover).
  3. Install the glove compartment liner.
  4. Connect the heater hoses to the heater core. Tighten the hose clamps.
  5. Add coolant to raise the coolant level to specification.
  6. Check the system for proper operation and for coolant leaks.

1980-81 Standard & High Output Heaters, Without Air Conditioning
  1. Disconnect the temperature cable from the temperature blend door and the mounting bracket on top of the heater case.
  2. Disconnect the wires from the blower motor resistor and the blower motor.
  3. Disconnect the heater hoses from the heater core and plug the hoses with suitable 5 / 8 inch; (16mm) plugs.
  4. Working under the instrument panel, remove two (2) nuts retaining the left end of the heater case and the right end of the plenum to the dash panel.
  5. In the engine compartment, remove one (1) screw attaching the top center of the heater case to the dash panel.
  6. Remove two (2) screws attaching the right end of the heater case to the dash panel, and remove the heater case from the vehicle.
  7. Remove nine (9) screws and one (1) bolt and nut attaching the heater housing plate to the heater case, and remove the heater housing plate.
  8. Remove three (3) screws attaching the heater core frame to the heater case and remove the frame.
  9. Remove the heater core and seal from the heater case.

To install:
  1. Position the heater core and seal in the heater case.
  2. Install the heater core frame (3 screws).
  3. Position the heater housing plate on the heater case and install the nine (9) screws and one (1) bolt and nut.
  4. Position the heater case to the dash panel and install the three (3) attaching screws.
  5. Working in the passenger compartment, install two (2) nuts to retain the heater case and plenum right end to the dash panel.
  6. Connect the heater hoses to the heater core. Tighten the hose clamps.
  7. Connect the wires to the blower motor resistor assembly.
  8. Connect the blower motor wires.
  9. Position (slide) the self-adjusting clip on the temperature cable to a position approximately one 1 inch; (25.4mm) from the cable end loop.
  10. Snap the temperature cable on the cable mounting bracket of the heater case. Then, position the self-adjusting clip on the door crank arm.
  11. Adjust the temperature cable.
  12. Check the system for proper operation.

Posted on Oct 05, 2010

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Heater does not work in my 1981 Bronco I've read that it could be the blend door actuator but I still want to replace the Heater Core the truck has A/C but I don't know if the core is in the cab or in the...


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Disconnect both hoses from the core and one of them also from the engine. Hook the other one back to where you took one off, making a loop. The picture below is not a bronco, but gives you the idea.
By the way, your core is easy to replace. It almost pops right out from under the dash. I ahve included picture below.

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Remove and replace heater core procedures:

  1. Disconnect the heater hoses from the heater core tubes and plug hoses.
  2. In the passenger compartment, remove the five screws attaching the heater core access cover to the plenum assembly and remove the access cover.
  3. Pull the heater core rearward and down, removing it from the plenum assembly.

To install:

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  2. Install the heater core access cover to the plenum assembly and secure with five screws.
  3. Install the heater hoses to the heater core tubes at the dash panel in the engine compartment. Do not over-tighten hose clamps.
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