Store the air bag module in a safe location with the front facing upward.
CAUTION
After disconnecting the negative battery cable, wait for 1 minute for the SRS module to deplete its energy.
CAUTION
Safely store the air bag module with the front side facing upward.
NOTE
The PCM is located at the right side of the instrument panel.
To install:
Install the heater core.
Install the heater core-to-air plenum cover and the cover screws.
In the engine compartment, install the heater housing air plenum nuts.
Install the PCM ground strap screw and the heat sink.
Install the evaporator core by perform the following procedure:
Install the evaporator core to the housing.
Install the evaporator housing cover and the cover screws.
If equipped with a 5.0L engine, install the evaporator housing heat shield, clips and the shield screw.
Install the air conditioning accumulator to the evaporator core.
In the engine compartment, install the 3 evaporator housing-to-chassis nuts.
In the passenger’s compartment, install the evaporator housing-to-chassis nut.
Inside the vehicle, connect the air conditioning system vacuum harness and the evaporator housing mounting nut.
Connect the condenser-to-evaporator tube.
Connect the air conditioning manifold and tube to the accumulator/drier.
Install the windshield washer reservoir/coolant recovery reservoir.
Install the speed control servo, the bolt and connect the speed control servo connector.
Connect the blower motor electrical connectors.
Connect the air conditioning cycling switch.
Using new O-rings, install the refrigerant lines to the evaporator core.
Install the PCM, the cover and the PCM cover nuts; then, disconnect the electrical connector.
Install the instrument panel by performing the following procedure:
Using an assistant, install the instrument panel.
Connect the harness and tighten the instrument panel-to-body harness bolt.
Push the instrument panel away toward the dash.
Install the fuse panel door.
Install both the right and left instrument panel-to-cowl bolts.
At both sides, install the windshield side garnish moldings.
Under the steering column, install the instrument panel brace bolt.
If equipped, install the upper series floor console.
Install the upper instrument panel bolts.
Install the instrument panel defroster grille.
Install the glove compartment.
Connect the radio’s antenna connector.
Connect the climate control vacuum harness connector.
Connect the blend door actuator’s electrical connector.
Install the passenger’s side air bag module, connect the electrical connector and install the air bag module-to-instrument panel screws.
Connect the bulkhead electrical connector wiring harness.
In the engine compartment, connect the electrical connectors and tighten the bulkhead wiring harness bolts.
Connect the power distribution box to its bracket.
Install both sides windshield garnish moldings.
At the right side cowl panel, connect the electrical connectors and ground wires.
Install both cowl side trim panels and the push pins.
Connect the Brake Pedal Position (BPP) switch electrical connector.
Install the steering column by performing the following procedure:
Install the lower steering column and the steering column-to-instrument panel nuts; then, torque the nuts to 10–13 ft. lbs. (13–17 Nm).
Using a new bolt, install the upper intermediate steering shaft-to-column shaft bolt and torque to 19–25 ft. lbs. (26–34 Nm).
Install the air bag sliding contact.
Connect the brake shift interlock solenoid electrical connector.
If equipped with an automatic transmission, connect the shift cable from the steering column shift tube lever and the steering column bracket.
If equipped with an automatic transmission, install the transmission range indicator cable and bolt.
At the base of the steering column, connect the electrical connectors.
Connect the ignition switch electrical connector and install the ignition switch bolt.
Install the instrument panel steering column opening reinforcement and the reinforcement bolts.
Install the instrument panel-to-steering column cover and the 2 cover screws.
Install the hood release and the hood release screws.
Install the parking brake release handle and the release handle screws.
Install the steering wheel to the steering column.
Install the steering wheel-to-steering column nut and torque the nut to 25–34 ft. lbs. (34–46 Nm).
At the both sides of the steering wheel, install the air bag module, connect the air bag electrical connector, install the steering wheel-to-air bag module screws and the cover plugs.
Connect the heater hoses to the heater core.
Refill the cooling system.
Connect the negative battery cable.
Evacuate and charge the air conditioning system.
Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks
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SOURCE: heater core gone out in 98 ford expedition-need help replacing
the heater core is located under the dash board on the passenger side. its a pain. here's more details
http://www.autozone.com/addVehicleId,2370702/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152801e55d6
SOURCE: Where is the heater core hose in my 2000 ford expedition?
check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.
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