SOURCE: cant find the blend door actuator on 2003 ford f150 super crew
The temperature blend door actuator is located on the right side of the transmission hump under the evap. case. The floor ducts cover it.
SOURCE: How do you change a blend door actuator on a 2003
Not sure why previous poster showed you how to fix a switch in the door, but anyways.....
I had same problem as you.
My Yukon has the single overhead door, not the "barn-doors", hopefully yours is the same. Open rear cargo door. Using a trim tool (buy the set from Harbor Frieght for less than $10) remove the lower trim (at carpet), upper trim (at headliner), then the right pillar trim (mine has small Bose speaker in it). Loosen trim between passenger side back door and the cargo area main right rear trim. Remove main cargo area right main panel, by unscrewing the big black know, prying out the small plastic plug, and carefully disconnecting the AUX power plug (looks like a cig lighter outlet) once you can get behind the panel a little bit.
Now you are looking at the entire rear system. There are 2 of these actuators. The front one controls airflow going either to floor or ceiling vents, the rear one (towards middle of entire unit) controls AC vs heat percentage flowing through the ducts. Unplug the connector, and 3 screws to remove it.
Install is the reverse.
SOURCE: where is temp door actuator located and what is easiest way to get to it
Behind the glove box only two screws. You will have to move the vacuum and it is right there.
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