Question about 1998 Ford Expedition
The switch has stopped changing the vent duct position. I've replace the switch but the problem continues. The problem occurred while changing positions. I'm assuming the vents are controlled by some kind of vacuum device or motor.
The AC and Heat work but only through the windshield vents. The rear AC and Heat are working fine.
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
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Posted on Jan 02, 2017
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