The insides of a stuck DeLorean window regulator motor
Here is a video where I dismantle the DeLorean window motor so you can see how it works. When I purchased my car, one of the electric window motors did not work at all, the other one rattled, but the tubing for the spring was broken and thus did not carry the window at all. The window itself was misaligned and stuck in the guide tracks inside the doors. I took the motors out, they were all rusty and full of grease and grime, and both the actual motor and the spring driven by the motor gear were completely stuck. I used a LOT of WD40, a wire wheel, a toothbrush, steel brushes and cleaned them inside and out. After that they both worked fine! I have attached the one with still working tubing in the car, and I have a working power window on the drivers side! I still need to reinforce the tubing on the passenger side motor, but with some plastics welding and the aluminum support bracket I hope it will last. I also had good use of this post from Carnutcase.
Update: I have reinforced the other motor with 2 component plastic weld, which cures like epoxy in a few minutes. The motor works fine and will be fitted in the car shortly.
Note: you can get new motors for about $300 from DMC and others. They are not original as far as i know, and need some drilling to mount.
Here are some links and videos on how to get the motor out: