2002 f150 supercrew blend door actuator

There is no process, just make sure the battery negative cable is disconnected before install the part.

Right side or left ? Electronic Automatic Temperature Control or manual ? Temperature or mode door ?
Temperature Blend Door Actuator - LH Removal and Installation
NOTE: It is not required to install the new LH temperature blend door linkage parts included in the LH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.
LH temperature blend door actuator and linkage

1. Remove the 2 lower steering column opening cover bolts.

1. Detach the lower steering column opening cover.

1. Disconnect the in-vehicle temperature sensor aspirator hose and electrical connector.

1. Position the instrument panel wire harness away from the LH temperature blend door actuator.

1. Remove the 3 LH temperature blend door actuator screws.

1. Disconnect the LH temperature blend door actuator electrical connector.

1. Remove the LH temperature blend door actuator.

1. Manually operate, and inspect the LH temperature blend door linkage for incorrect placement, binding or damage.

Temperature Blend Door Actuator - RH, Dual-Zone EATC Removal and Installation
NOTE: It is not required to install the new RH temperature blend door linkage parts included in the RH temperature blend door actuator service part kit if only the temperature blend door actuator requires replacement and the linkage parts are not broken or binding.
RH temperature blend door actuator and linkage

1. Disconnect the glove compartment damper from the glove compartment.

1. Remove the glove compartment.

1. Remove the RH lower instrument panel insulator.

1. Remove the RH lower floor console trim panel.

1. Remove the 3 RH temperature blend door actuator screws.

1. Disconnect the RH temperature blend door actuator electrical connector.

1. Remove the RH temperature blend door actuator.

1. Manually operate, and inspect the RH temperature blend door linkage for incorrect placement, binding or damage.
2. Mode Door Actuator - Defrost/Panel/Floor Door
3. Removal and Installation
   NOTE: The defrost/panel/floor mode door actuator can be accessed from below the driver side of the instrument panel.
   NOTE: It is not required to install the new defrost/panel/floor mode door linkage parts included in the defrost/panel/floor mode door actuator service part kit if only the mode door actuator requires replacement and the linkage parts are not broken or binding.
   Mode door actuator and linkage
   1. Remove the 3 defrost/panel/floor mode door actuator screws.
   1. Disconnect the defrost/panel/floor mode door actuator electrical connector.
   1. Remove the defrost/panel/floor mode door actuator.
   1. Manually operate, and inspect the defrost/panel/floor mode door linkage for incorrect placement or damage.
   Mode door actuator linkage only
   
   1. Remove the mode door linkage.
      1. Depress the tab and remove the panel door lever.
      1. Remove the floor/defrost door intermediate lever screw and floor/defrost door intermediate lever.
      1. Pull straight outward to remove the floor/defrost door lever.
   Mode door actuator and linkage
   
   1. NOTE: When installing the mode door actuator, make sure that the panel door lever and floor/defrost intermediate lever are correctly aligned with the mode door actuator cam.
      To install, reverse the removal procedure.

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You need to google 2001 f150 blend door actuator replacement. It is slightly right of center above the plastic duct work for the floor area. All lower dashboard plastic is removed to get at it.
Then the ducting is removed.
http://www.autozone.com/repairguides/Ford-Pick-Ups-Expedition-Navigator-1997-2000/Heating-and-Air-Conditioning/Blend-Door-Actuator/_/P-0900c152801e55ed

You need to google 2001 f150 blend door actuator replacement. It is slightly right of center above the plastic duct work for the floor area. All lower dashboard plastic is removed to get at it.
Then the ducting is removed.
http://www.autozone.com/repairguides/Ford-Pick-Ups-Expedition-Navigator-1997-2000/Heating-and-Air-Conditioning/Blend-Door-Actuator/_/P-0900c152801e55ed

The temperature blend door actuator itself is not repairable....it will have to be replaced. Its located under the center dash and is screwed to the heater box. I have included a picture of what it looks like.

Do you hear any clicking or popping noises coming from dash area when you try to change the temperature? If so, you have either a bad blend door actuator or a broken blend door. If it's just the actuator, you can find it by following the popping noise to the location. It is under the dash close to the passenger's side of the vehicle. The actuator is easy to change once you find it. If the blend door is broken, you will have to pull the dash out and remove the air plenum from inside the dash to gain access to the blend door.

The temperature blend door actuator is located on the right side of the transmission hump under the evap. case. The floor ducts cover it.

most likely needs a LH (bottom) temp actuator. Located in the center of the dash on the bottom, you have to remove the hush panel on the rh side of the truck

sounds like your blend door actuator has failed, or the lost vacuum to this actuator, or something got into the vents holding the blend door into position. Most common is the acuator failing, good news is its a fairly inexpensive part, but gettin to it is not fun, its it the ductwork in behind the dash, I'm not sure on your specific model but most I have seen the dash has to come completely out. If it gets to that point you may want a repair shop to do that.But hopefully you get lucky and its easy access.