Photos of YOUR H1 12-17-2011, 05:13 AM Location: ontario On the drivers side I was able to gain access to it by laying on my back and reaching up into the dash with my arm. urchinTracker(); It doesn't have to be big either. Posts: 620 sun roof drain holes are plugged.open sunsoof.there are 2 drain holes,,toward front of vehicle.run a length of wire.i used straightened coat hanger..worked fine.good luck 6 people found this helpful. hummer h3 passenger floorboard wet. light bar, 2 Rigid Industries 10 inch Leds Join Date: May 2008 /* Second Ad */ Hummer H3 Leaking Water Sage V. 83 subscribers Subscribe 14K views 5 years ago Fix for Hummer H3 Leaking water onto floor board after rain. TTLex I had the water on the carpet issue after being parked in a big thunderstorm and the water was getting under the roof marker lights. I'm going to let the guys in shop do there stuff. , ,