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Thomas
Thomas, Auto Service Technician
Category: Ford
Satisfied Customers: 364
Experience:  Ford engine , airconditioning, drivabillity and electrical specialist
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1997 ford expedition: heater core..mist coming through the vents

This answer was rated:

how do i check/replace a heater core in a 1997 ford expedition, I have mist coming through the vents with no heat.

Good morning. The mist through the vents is what you would look for for evidence of the heater core leak, Also if you run your heat you might be able to smell the coolant or a real sweet acidic smell. There isnt a visual check because the dash has to be removed to access the case that the core is in. This is a pretty complicated repair and is also pretty expensive.

Thomas and 7 other Ford Specialists are ready to help you
Customer: replied 9 years ago.
Reply to Thomas's Post: Thank you for you response. I was aware of the reason for the smell and having to take the dash apart to get to the heater core.

I was looking for any information: diagrams/procedures/special tools etc I would need to tackle this project.

Thanks.

Here is detailed instructions for removing the dash and core.

Disconnect the battery ground cable

  • Remove the console tray mat.
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  • Remove the console tray front screw
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  • Remove the console tray rear screw
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  • Remove the console tray
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  • Remove the center console front bolts
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  • Disconnect the center console electrical connector
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  • Remove the two rear center console bolt covers
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  • Remove the two rear console bolts.
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  • Remove the center console.
    • Lift the front of the console and slide rearward to disengage floor brackets
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    • NOTE: Move the shift lever to the 1 position to ease removal.

      Carefully pry to release the (A) clips and remove the (B) steering column opening cov
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    Pull to release the three (A) clips and remove the (B) fuse door

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  • Disconnect the hood latch release handle from the instrument panel steering column cover (044F08).
    1. Remove the screws.
    1. Disconnect the hood latch release handle.
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  • Disconnect the parking brake release handle from the instrument panel steering column cover.
    1. Remove the screws.
    1. Disconnect the parking brake release handle.
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    If equipped, remove the instrument panel floor duct panel.

    • Remove two push clips and release one expander clip

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    1. If equipped, remove the console assembly; refer to the procedure in this section.
    1. Remove the instrument panel steering column cover.
      1. Remove the bolts.
      1. Remove the instrument panel steering column cover.

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  • Remove the LH and RH scuff plates.
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    Remove the LH and RH cowl side trim panels

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    Disconnect the brake on/off (BOO) switch electrical connector

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    Remove the (A) radio ground and the (B) GEM/CTM ground

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    Disconnect the instrument panel main harness connectors

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  • Remove the bulkhead wiring harness from inside the engine compartment.
    1. Loosen the bolts.
    1. Disconnect the bulkhead electrical connectors.
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  • Pull the bulkhead electrical connector handle to disconnect the harness.
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    Disconnect the air bag diagnostic monitor electrical connectors

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    Disconnect the inertia fuel shutoff switch electrical connector

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  • Remove the grounds from the RH cowl.
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    Disconnect the electronic actuator electrical connector

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    Disconnect the climate control head vacuum line connector

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    Remove the instrument panel steering column opening cover reinforcement (04502).

    1. Remove the nuts.
    1. Remove the instrument panel steering column opening cover reinforcement

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  • Lower the steering column (3C529).
    1. Remove the steering column support nuts.
    1. Lower the steering column.
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    1. Remove the radio chassis; refer to Section 415-01 .
    1. Remove the instrument panel relay cover (044F46).
      1. Remove the instrument panel relay cover.
      1. If equipped, disconnect the autolamp sensor

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  • Open the glove compartment and release the two door stops.
    • Depress glove box door stops to release.
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    WARNING: ALWAYS WEAR SAFETY GLASSES WHEN REMOVING AND HANDLING AN AIR BAG.

    WARNING: CARRY A LIVE AIR BAG WITH THE BAG AND TRIM COVER POINTED AWAY FROM YOUR BODY. AN ACCIDENTAL DEPLOYMENT WILL THEN DEPLOY WITH MINIMAL CHANCE OF INJURY.

    WARNING: PLACE A LIVE AIR BAG ON A BENCH OR OTHER SURFACE WITH THE TRIM COVER UP.

    Remove the passenger side air bag module (044A74).

    1. Disconnect the electrical connector.
    1. Remove the screws.
    1. Remove the passenger side air bag module.

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  • Remove the RH assist handle screw covers.
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    Remove the RH assist handle screws

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  • Remove the RH assist handle (31406).
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    Remove the RH windshield side garnish moulding (03598

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    Remove the instrument panel bolt below and to the left of the glove compartment

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    Remove the instrument panel bolts behind the passenger side air bag module opening

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  • Remove the instrument panel bolts on the top of the instrument panel (04304).
    1. Remove the covers.
    1. Remove the bolts.
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    Remove the instrument panel bolt on the relay bracket

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    Remove the instrument panel bolt below and to the left of the cigar lighter and power point

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    Remove the instrument panel nut on the bottom RH corner of the instrument pane

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    Remove the instrument panel nut on the bottom LH corner of the instrument panel

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    1. Remove the instrument panel bolt under the center of the steering column.
    1. Remove the instrument panel bolt on the bottom LH side of the instrument cluster opening

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    Remove the instrument panel bolt on the bottom RH side of the instrument cluster opening

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  • Disconnect the (A) air bag sliding contact electrical connectors and the (B) anti-theft sensor electrical connector.
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    Disconnect the remaining electrical connectors on the steering column

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    Remove the instrument panel to floor brace bolt.

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    Remove the instrument panel

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    Compress the holding tabs and disconnect the heater water hoses at the heater coregraphic

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

    1. Remove the screw.
    1. Remove the A/C plenum demister adapter

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    Disconnect the vacuum line.

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  • Remove the heater core bracket.
    1. Remove the two screws.
    1. Remove the bracket.
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    Remove the plenum assembly top.

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

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    1. Remove the blend door assembly from the case.
    1. Remove the heater core.

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    I hope that this helps you. this is a really hard and indepth job to do, But wil save you a 1000 dollars doing it yourself.