My '99 Eddie Bauer Expedition blows cold air when the heat is on and hot air when the A/C is on in the front but the middle and rear vents appear to be working just fine. I've been told that a "mixer door" may be broken or the stepping motor is bad. Where are these located on an Eddie Bauer model and how do I test for these problems? The only information I've been able to find says that the stepper motor is white and that the mixer door is located down under the center of the console but I cannot find anything that even remotely resembles these parts with all of the covers and shrouds under the dash.
The heater is a long plastic box and the mixer door is inside of the box. The stepping motor controls the door.
SOURCE: Oxygen Sensor Location 2001 Ford Expedition Eddie Bauer
There are four o2 sensors on this truck. one on each side just below the exhaust manifold, and one on each side behind the second catalytic converters. (just about even with the back of the front doors.
SOURCE: a/c problem
You either have a bad control, or motor running the air direction door in the front HVAC unit, or a door that is stuck.
The front and rear units are totally separate.
The door directs where the air, cold or hot, should come out, whether it is panel vents, floor, defrost, or any combination of those.
This door and motor are located inside the heater box which usually requires a lot of the vehicle dash assembly to be taken apart to get to these parts.
SOURCE: diagram bypass heater cord on 2001 ford expedition eddie bauer
the heater bypass is quite simple, if you look at the firewall you will see two medium sized coolant lines, remove them from the firewall and link them together using a proper sized tube, you can purchase a kit at a parts store quite cheaply
SOURCE: 2004 Ford Expedition XLT, front blend door actuator
Hope I was avle to help, glad you up and going.
SOURCE: I have a 1998 Ford
Sound like a vent actuator is not getting vacuum or is broken.See attachment
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