Question about 2001 Ford Expedition
Changed the heater core and now when you turn the heat on the back is running on high even though the switch is turned to off
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Posted on Jan 02, 2017
Very likely the blend door is broken. This door is mounted beside the heater core, blends cool air with hot depending on the position of the door. At the bottom of the door at the hinge point, there is a gear and coupling driven by an electric motor to position the door. The coupling is a drive much like a square drive ratchet and socket made of plastic and often cracks allowing the drive to turn without changing the door position. I've heard you can drill through the outer housing and put a screw in the door through the drive gear, but you would have to know your way around this area well.
I repaired mine by replacing the blend door, a big job at best. The entire dashboard must come out to access the top of the heater core housing which must be removed.
Posted on Oct 12, 2008
SOURCE: 2000 expedition heat problem
first of all I would make sure the car has proper amount of coolant and you are right it is very possible you have an air pocket in the system also ask your self did you change the thermastat after you did the heater core when the car is cold make sure there is coolant at the cold mark on the reservior bottle because you might not have enough coolant then start the car and get it up to temp and if the coolant goes not go up to the hot mark when the car gets to temp you do not have enought coolant just keep adding coolant and you will see the bubble after the thermastat opens
Posted on Jan 12, 2009
yes it is the switch. You have to pull the radio then the outer trim panel then the eltronic control assembly it is only a 30 .00 part but a pain to do
Posted on Mar 27, 2013
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