A slider window assembly for a vehicle includes a frame portion having an upper rail and a lower rail, at least one fixed window panel that is fixed relative to the frame portion, and a movable window panel that is movable along the upper and lower rails. The movable window panel is movable between a closed position and an opened position. The movable window panel may include a panel portion and a carrier element integrally formed with the panel portion, with the carrier portion slidably received in the lower rail and movable along the lower rail as the movable window panel is moved between its closed and opened positions. The window assembly may include conductive heater grids that are electrically powered without use of jumper wires that electrically connect between heater grids of the fixed window panel at opposite sides of the movable window panel.