Question about 2000 Ford Expedition
There is no heater control valve in this truck, heat control is done through what are called blend doors. So the issue may be the front blend door motor has failed, this is very common on all Ford heatimng systems except the Focus.
Posted on Dec 17, 2008
If the front heat doesn't work, but the rear does, it's most likely one of two problems: (1) the front "blend door" is broken, and not changing position when the switch is moved from cold to hot, or (2) the front heater core is plugged. You can figure out if it's the heater core by checking the inlet and output hoses on the heater core, with the vehicle up to operating temparature. They're in the engine bay, passenger side, going through the top fo the firewall. If only one is hot, then the heater core is plugged. You can also check the blend door by flipping down the glovebox, and drilling an observation hole into the plenum (see YouTube videos on "blend door" and "heatertreater" to figure out the location). If you drill a hole of 3/4" or larger, you can easily cover it again with duct tape, but use the hole to see whether the blend door moves when you change the switch position. Replacing either is a big job, but the heatertreater video shows you the "easy" way to fix the blend door.
Posted on Nov 29, 2010
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Posted on Jan 02, 2017
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