My 12 passenger econoline has the ac/heat/vent controls on the front dash. No back controls. Therefore, my a/c works fine both in front and back top vents. However, when I change the front control to floor and set the front thermostat to cold, I will get cool air coming out on the floor in the front, but in the back it is always hot. The thermostat does not seem to control the air that comes out the floor in the back. My rear floor vents only blow hot air.
SOURCE: 2004 Ford Expedition rear floor cool/heat
Item
Part Number
Description
1
—
Air inlet door
2
—
Temperature blend door
3
—
Headliner airflow
4
—
Auxiliary mode door
5
—
Floor airflow
6
18476
Heater core
7
19860
Evaporator core
8
19805
Blower motor
The auxiliary A/C and heating system has the following features:
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I would say the auxiliary mode door (#4) electric motor is not wokring.
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Auxiliary Blend Door Actuator —Air Distribution
Removal and Installation
SOURCE: Vent control
You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR
Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.
SOURCE: 2004 Ford Expedition XLT, front blend door actuator
Hope I was avle to help, glad you up and going.
SOURCE: Air doesn't come out front vents
look under your hood for any vaccuum leaks. check all rubber hoses under the hood. they should be roughly the size of your pinky.
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