05 Expedition rear blower always on full speed and blows out cold regardless of setting

Stephen Pearson

• 49 Answers
• Posted on Dec 03, 2008

SOURCE: Heater only blows hot (well, warm) on full speed of fan

Replace the temp control on this car, it should be electrical control not cables.

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:

• 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.

1. Remove the RH quarter trim panel cup holder and access panel.

1. Remove the screws.

1. Disconnect the blend door actuator electrical connector.

1. To install, reverse the removal procedure.

SOURCE: Problem:

Problem is most likely in the electronic blend door motor or the door itself has broken.
To access the electronic temperature blend door actuator remove cassette storage box or center shelf unit, if equipped.
Remove instrument panel ash receptacle by depressing service lever. Disconnect electrical harness connector from A/C electronic door actuator motor.
Remove three retaining screws.
Carefully pull A/C electronic door actuator motor outward and off A/C evaporator housing assembly.Make sure the door it self is not cracked where the actuator hooks to it and that it will move.
Here ia a link to a pick of what you are looking at.

http://i253.photobucket.com/albums/hh43/chuck943/L9819A.gif

SOURCE: Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is cold

the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

SOURCE: 2004 Ford Expedition XLT, front blend door actuator

Hope I was avle to help, glad you up and going.