How to replace heater core 1999 expedition
Heater Core
1. Disconnect the battery ground cable
2. Drain the engine coolant.
3. Remove the instrumental panel.
4. If equipped with the 5.4L 4V engine, remove the junction block splash shield.
5. If equipped with the 5.4L 4V engine, remove the bolts and disconnect the cable ends from the starter relay.
6. If equipped with the 5.4L 4V engine, remove the junction block bracket.
7. Disconnect the heater core hose couplings.
8. Remove the retaining screw and remove the A/C plenum demister adapter.
9. Disconnect the vacuum line from the A/C plenum demister adapter.
10. Remove the heater core bracket.
11. Remove the 13 plenum chamber top retaining screws.
12. Remove the plenum chamber top.
13. Remove the blend door assembly from the case.
14. Remove the heater core.
15. The installation is the reverse of the removal.
The heater core should be encased in a box up inside the dash.The best way to find this is to locate the heater hoses that go through the fire wall(about 1 1/4 in diameter).This is a very tight job and you will spend most of you time laying on the floor taking out screws.Be careful not to loose any of the heater core casing screws or bolts and when refilling the coolant system fill the radiator directly,start the engine with the radiator cap off,the level will drop,fill the radiator the rest of the way and replace the cap,allow the engine to reach normal operating temp.(about 10 to 15 minutes)so that the themostat will open and then allow the engine to cool and recheck fluid level.
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: How to replace heater core ford expedition 1999
My friend you do have a biggy! You will need a helper to remove the bolts. The bolts have nuts that need another to hold. But you will need to remove the glove box to get to them. Be very careful, as there is always a hidden screw. Do replace the heater hoses at the same time!
Expect a full day to replace this core!
SOURCE: how to replace heater core ford expedition 1999
http://www.youtube.com/watch?v=qa7TiLRn9oE
Go to the above link for a video procedure to explain the removal of heater core.
SOURCE: The rear heater core is clogged, how hard is it to
About 1-2 day's job. You gotta remove the dash.Usually, it is in the center console by the firewall.
The heater housing is disassembled to get to the heater core.
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