Abstract: A motor vehicle window construction has a pull-pull closed loop cable drive system for opening and closing a glazing pane slidably mounted in a frame. A motor and drive drum apparatus for powered operation of the window construction is mounted to the vehicle body at a location remote from the frame. The cable system includes drive cable wrapped around the drive drum. A first drive cable segment extends laterally from the glazing pane or from a slidably mounted subassembly incorporating the glazing pane, toward one side of the frame member. A second drive cable segment extends from the glazing pane or subassembly toward the opposite side of the frame. The glazing pane and drive cable together form a closed loop from the drive drum. Rotating of the drive drum in a first rotational direction by actuation of the drive motor pulls the slidably mounted transparent pane toward its open position. Rotating the drive drum in the opposite rotational direction pulls the glazing pane toward its closed position.