Windows in your campervan are either slider or torque pane type. Open slider windows by pulling the center handle and sliding the window. Please do not pull the tab on the flyscreen. Open and adjust torque windows by turning the knob located on the side of the window frame.
On your ventilating windows, water is trapped by the frame. During a heavy downpour or washing, water may be seen in the lower portion of the frame. The sloping sill and weep holes allow the water to drain to the outside. These weep holes must be kept open.
If water collects in the bottom channel and overflows, check the weep holes for debris, obstructions, and clean as necessary.