Henry C

I had this problem on my high milage 96 Galaxy (windscreen obviously replaced several times before I bought it). The glue holding the screen in place had come unstuck down the side. From the inside you could slide a thin blade between the frame and the glass. When the boot or doors were shut hard, the windscreen could be seen moving away from the frame - obviously a poor quality job last time the screen was replaced. A friendly local windscreen fitter managed to reseal it, from inside the car, without removing the screen or getting mastic on the trim. Nice dry car now! I've now raised the black box under the passenger seat further off the floor. If it floods, the sun roof opens to let more water in. Hope this helps. Henry