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Re: 2004 Ford Expedition rear floor cool/heat
Air inlet door
Temperature blend door
Auxiliary mode door
The auxiliary A/C and heating system has the following features:
The auxiliary A/C and heating system is functional whenever the instrument panel mounted A/C control is in any position except OFF.
The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
Air is cooled and dehumidified by the auxiliary A/C evaporator core only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor operation.
The temperature blend door and the auxiliary mode door are controlled by electric actuator motors.
Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core.
Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the auxiliary mode door to direct air flow between the panel (headliner) registers and the floor duct.
I would say the auxiliary mode door (#4) electric motor is not wokring.
Auxiliary Blend Door Actuator —Air Distribution
Removal and Installation
Remove the RH quarter trim panel cup holder and access panel.
Remove the screws.
Disconnect the blend door actuator electrical connector.
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Sounds like your heater coolant hose door flap is broken or loose. May want to check behind the heater controls, if your components are mechanically operated. If electronically, may need to perform more troubleshooting before replacing this component.
you need to have automatic ac and heater control checked out at a garage problem could be in the mode switch or electrical problem causing front blend door actuator not working properly.your vechicle has the EATC SYSTEM which is computer control need diagnostie equipment to fix.
Expedition uses the same HVAC system as the Ford F150 pickup truck. The
Expedition is a little tricky though because you have to remove the center
console and floor heat distribution vent to access the actuator motor.
Once you remove the motor, you can examine the blend door axle for
cracks or breakage. This is a common fail mode on the Expedition.
HeaterTreater is the world's leading company for aftermarket blend door
fixes and has a product for the Expedition. Additional diagnostic
information and pictures are available on the Ford Expedition
HeaterTreater Ebay listing or the web site at www.heatertreater.net.
There is an inexpensive effective fix available that replaces the cheap
plastic door with steel that will outlast the vehicle.
This sounds like a blend door or actuator problem. Testing this is a pain and the repair may envolve removing the dash board and center console. I strongly recommend taking the vehicle to a repair shop. This one is beyond the DIYer especially if your pressed for time.
Sounds like your rear actuator for heat and cool is stuck in one position this normally happens when the plastic gears shear down, you will need to change out the actuator. You have two on the rear passenger side, one is for teh hot and cold and the other is for teh upper and lower air
With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps
I had the same problem and found that the vacuum tube located behind the battery was cut. The tube is about the size of an ink tube inside a ball point pen. The size is 5/32" and can be purchased at most auto parts stores. A quick splice and you will be back to cooling.