My 06 H3 was leaking when it rained. It turned out to be the sunroof. There are two drain tubes in thefront of the sunroof that run the water down the corners to the groundand two drain tubes that drain water out the back corners. The waterwould seep around the glass, which is expected, but both of the tubeson the front of mine were plugged, and the water would overflow behindthe dash and fill my floorboards. If my H3 was leaning to the leftduring a storm then the drivers side would be full of water. If leaningright, then the passenger side. I had to open sunroof and blowcompressed air into the drain holes to clear them, but be careful, toomuch pressure will separate tubes from sunroof and then you will have toremove the inside paneling around sunroof to get to tubes andreconnect. You may only have one side plugged. you can test it byopening sunroof and pour a little water in the small catch pan in thefront of the sunroof and see if it drains as expected (to the groundunder the firewall
on left AND right side). You can see the holes in each corner of catchpan to drain the water. Plug one with your finger, then the other tofind the plugged side. Good luck!! Hope this helps!!