Sometimes the vent windows' latch can pop open; if it will not stay closed or rattles, the latch assembly should be replaced.Google+
Car Problem Reports
Plymouth Grand Voyager Vent Window Latch Can Pop Open
Plymouth Grand Voyager Problem
Visitor, 1994 Plymouth Grand Voyager
Sliding door vent window latch pops open almost every time door is closed & rattles as driving down road if not relatched. If door is subsequently slammed closed with latch loose, the swinging force of window can be sufficient to break latch. Looking for an after market latch designed better. Have lost window glass & latch due to this design problem. More pronounced with new door seals that require more force to close door.
1994 Plymouth Grand Voyager SE 3.3 V6. All my vent windows have problems staying shut. Annoying while driving and will eventually replace as soon as I learn how and get parts. At the moment, I rigged it a bit by replacing the pins in the latches with a plastic peg-like piece that fits snug in the hole. Have several other minor problems but all in all a good buy for me at only $600 then replacing ball joints, tie rod tips, brake pads, rotors and drums.