Tip & How-To about Hummer H3

H3 Hummer leaking water into cab.

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 firewallon 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!!

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3 Answers

2006 hummer h3 has a leak on passenger side under the dash during a rain storm


My 06 was leaking during rain also. It turned out to be the sunroof. There are two drain tubes in the front of the sunroof that run the water down the corners to the ground and two drain tubes that drain water out the back corners. The water would seep around the glass, which is expected, but both of the tubes on the front of mine were plugged, and the water would overflow behind the dash and fill my floorboards. If my H3 was leaning to the left during a storm then the drivers side would be full of water. If leaning right, then the passenger side. I had to open sunroof and blow compressed air into the drain holes to clear them, but be careful, too much air will separate tubes from sunroof and then you will have to remove the inside paneling around sunroof to get to tubes and reconnect. You may only have one side plugged. you can test it by opening sunroof and pour a little water in the small catch pan in the front of the sunroof and see if it drains as expected (to the ground under the firewall on left AND right side). You can see the holes in each corner of catch pan to drain the water. Plug one with your finger, then the other to find the plugged side. Good luck!! Hope this helps!!

Mar 01, 2010 | 2009 Hummer H3

2 Answers

water leaks in my 2006 hummerh3's right rear cargo area. My rear passengers seat belt gets wet and so does all around the cloth where the split seats are and also on the floor. I have taken it to hummer twice and once they said it had no leak and the second time they said it was from the sunroofs rear drain tubes. They said they cleared them. This was one week ago and it rained last night and the leak is back. Any ideas?


My 06 did this in the front and it was the drain tubes. If you paid to have it fixed, then they should look at it to see if one of the tubes came loose or maybe they didn't connect it properly. I am sure this is the problem (plugged or disconnected drain tubes) but I wouldn't want to pay for it every time it happens. make them fix it permanently!! Good luck with that!!

Feb 05, 2010 | 2009 Hummer H3

8 Answers

water leaks into right side floor board during a blowing rain?


My 06 was leaking during rain also. It turned out to be the sunroof. There are two drain tubes in the front of the sunroof that run the water down the corners to the ground and two drain tubes that drain water out the back corners. The water would seep around the glass, which is expected, but both of the tubes on the front of mine were plugged, and the water would overflow behind the dash and fill my floorboards. If my H3 was leaning to the left during a storm then the drivers side would be full of water. If leaning right, then the passenger side. I had to open sunroof and blow compressed air into the drain holes to clear them, but be careful, too much air will separate tubes from sunroof and then you will have to remove the inside paneling around sunroof to get to tubes and reconnect. You may only have one side plugged. you can test it by opening sunroof and pour a little water in the small catch pan in the front of the sunroof and see if it drains as expected (to the ground under the firewall on left AND right side). You can see the holes in each corner of catch pan to drain the water. Plug one with your finger, then the other to find the plugged side. Good luck!! Hope this helps!!

Jan 26, 2010 | 2009 Hummer H3

4 Answers

06 hummer h3-water on passenger floor after a rain


Hey I have the same problem, but only when it rains, it comes from the sunroof then leaks into the carpet.

Aug 17, 2009 | 2006 Hummer H3

2 Answers

the sunroof on my 2009 Hummer H3 leaks.


What they meant by "they all leak" is that the sunroof seals around the glass are not meant to keep water from getting down in the sunroof, and tray and drains are there to drain the water that does get down in there. The problem most likely exists with your drainage tubes. They can either be clogged, or in my case with my 06 H3, the tubes were somehow disconnected and I had to drop down the roof panel to reconnect one.

Jul 08, 2009 | 2009 Hummer H3

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