The motor that moves up and down the back does not work.

This is a known issue on this model with windows not working at they should.

https://www.google.com/search?q=Explorer+sporttrac+window+won%27t+move+up+or+down

Check the relay.

https://www.google.com/search?q=2001+ford+explorer+sport+trac+power+window+relay

..

the backward motor has quit working, go to junk yard and find same car in your year range up or down pay particular attention to how your seat track looks. designs change every three or four years. it must be exact or it will not work.

If the controls still work to move the seat up and down and the seat back forward and back then you've ruled out a fuse. The switch could be faulty, could be a broken wire to the motor or the motor itself could be bad.

There are 2 motors under the seat that control how it moves (one for forward/back and one for up/down) Check to make sure the connections are still connected/clean. If they are then your motor burnt out or there is something jamming the rollers on the track the seat rides on.

will or wont move foward?
you can get to the wiring block under seat. isolate wiring from motor 1 of three, (middle motor- foward back, front motor - front seat base up / down, back motor - back seat base up /down) does it work of mem. buttons? or when u lean seat foward (entry assist).

If the mirrors only move down and not up I would suspect the mirror switch , the mirrors use one motor to move the glass up and down,and another motor to move them in or out , and if the mirrors move down the motors are working.the only other possible problem would be a wiring but highly unlikely due to the fact that the turning the motors in a different direction is done by switching the polarity to the motor which requires both wires to be good to make the motors move in the down direction ..check the mirror switch I am sure you"ll find that"s your problem

Individual motors for horizontal and vertical movement. Try moving seat while looking under at motors. Once you find the one that is not moving, try holding switch to foreward position and tap on motor with a screwdriver handle. This may get it going long enough to move so you can reach the pedals easier.

Well either the gears aunt lined up correctly or the motor old and tired. Doesn't have enough power/torque to spin gears. might just need a new motor.

you have to replace the window regulator reason why is because the cable ripped which would cause the motor to work without moving the window up or down .. regulator is the cable and the rails were the motor makes the woindow move up and down on. you have to replace it.

the rare several motors under seat to control movement in different positions. try to lift seat all the way up and tap lightly on motor not working wihile toggle switch to move forward sometimes works