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Eric, Automotive Repair Shop Manager
Category: Ford
Satisfied Customers: 31930
Experience:  Automotive Repair Shop Manager, Technician
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How to replace the heater core in a Ford F150?

Resolved Question:

How do I replace the Heater Core in a 1985 Ford F 150, InLine 6 (4.9L) with a/c?

Submitted: 7 years ago.
Category: Ford
Expert:  Eric replied 7 years ago.


Below are directions:

1980-86 With Air Conditioning

See Figures 2, 3, 4 and 5

Do not discharge the air conditioning system.

  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 eight (8) screws attaching the heater core cover to the plenum and remove the cover.
  4. Remove the heater core from the plenum taking care not to spill coolant from the core.

Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the heater plenum, 1980-86 with manual A/C

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Fig. Fig. 3: Removing the glove compartment liner to gain access to the heater core,

Click image to see an enlarged view

Fig. Fig. 4: Removing the heater core cover retaining screws

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Fig. Fig. 5: Removing the heater core cover

To install:

  1. Install the heater core in the plenum.
  2. Install the heater core cover (eight screws).
  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
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