What is a window regulator?
Thanks

FYI from Helm's manual:
Window Regulator Replacement
CAUTION: Disconnect power window switch when working inside driver's door. When operated, the Express Down Feature allows the window to drop very quickly, without stopping, which could cause personal injury
Removal
1. Place window in halfway down position.
2. Remove front side door trim panel.
3. Remove water deflector.
4. Support window in position by inserting rubber wedge door stops at front and rear of window between window and door inner panel.
5. Remove window rear guide nuts so rear guide channel can be moved.
6. Remove window regulator rivets by drilling out rivets with drill.
7. Remove electrical connectors from regulator motor by sliding motor and regulator rearward, if equipped.
8. Remove window regulator from channels.
9. Remove window regulator with regulator motor attached if equipped through rear access hole.
Installation
1. Install window regulator with regulator motor through rear access hole.
2. Install windor regulator to channels in door.
3. Install electrical connector to regulator motor, if equipped.
4. Install regulator rivets to regulator.
5. Install window rear guide channel nuts.
6. Install water deflector.
7. Install front side door trim panel.


