So I bought a 2007 H3 and had to do some major repairs which I knew about. The most frustrating part was after a heavy rain, I'd get into the drivers seat and get soaked big time when I backed the Hummer up. After googling many search phrases, I found using the nylon cord from a weed whacker in the drain holes on top cleared the clog. Open the sunroof all the way then Slowly push down. I was able to get a good distance, pulled up and saw some muck. I then took hot water and dish detergent with a degreaser and poured in down the little opening. Bam! The water came out the bottom. Some small items dripped out it. One site suggested a tire air hose BUT if u use too much pressure u can break the drain tube. This method took about ten minutes both sides.

 

He's a mean looking dude

 

 

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