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Heater Core

4893 Views 3 Replies 3 Participants Last post by  jerryh20
How to replace the heater core on my 1997 Ford Expedition 4.6.
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Section 412-02: Heating/Defrosting
1997 Expedition Workshop Manual
Heater Core


  1. Disconnect the battery ground cable.

  1. Drain the radiator; refer to Section 303-03 .

  1. Remove the instrument panel; refer to Section 501-12 .

  1. Compress the holding tabs and disconnect the heater water hoses at the heater core.

  1. Remove the A/C plenum demister adapter (19E662).
    1. Remove the screw.
    1. Remove the A/C plenum demister adapter.

  1. Disconnect the vacuum line.

  1. Remove the heater core bracket.
    1. Remove the two screws.
    1. Remove the bracket.

  1. Remove the plenum assembly top.
    1. Remove the 13 screws.
    1. Remove the plenum assembly top.

  1. Remove the blend door assembly from the case.

  1. Remove the heater core.


  1. NOTE: When the battery (10655) is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 mi) or more to relearn the strategy.
    To install, reverse the removal procedure.

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I hope that helps and, welcome to the forum!

Mac has helpful info - register - add vehicle and go to repair section
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