Read the above posts and start there. Go get the silicone before you start. If you read it, you'll see some dealers have fixed it and others haven't.

There's also other information available by using the "find" tab above and typing in "leak". Hope that helps.

shiz yo, dem H2's have all kindz of TSB's and shiz. yo mang dem H2 are trash, at least dem rigs have good resale value, ahh yea mofoz i forgot dem H2's drop in value faster den yo mama drops to her kneez fo a mic check. ah skeet skeet skeet mther fcker.

Hey BlingTard....nice hearing from you. Isn't it great the way GM/Hummer stays on top of their service issues?

dem rigz aint shiz yo, yall are best off drivn dem slop buckets into a wall an be collectn dem insurence papas.

Nice area you frequent, pimp that flop dizzle fo snizzle. Cuz ya skanked up get-up ya sportin' on da bones look like some 80's Flav-a-Flav sheat. And yo short- bitch look like Beetlejuice skrate trippin Midget. Skeet Skeet see ya on da skreet bizich.

Well, I'm back from a business trip and wanted to take a sec to provide an update on my leak. I went and boat "black adhesive silicon" and last Thursday. I removed the corner roof light and -- to my surprise -- found that the lightbar wiring travels very nicely into the truck through a rubber gromet. Also running through the same gromet are the wires for the corner light and it all looks very stock. So I got the ol' garden hose out and poured water all over the spot where the corner light sits. I made sure to drench the rubber gromet, etc. I looked inside my truck and there was no water coming in. :-( I spent about 15 or 20 minutes doing this and nothing. So then I thought maybe my leak is not the corner light, but rather the sunroof or maybe down by the wiring harness for the door. Still nothing. Is it possible that the water has to build up or collect somewhere first before finally leaking into the vehicle? Because I spent so much time spraying water on the corner light, I could not spend too much more time spraying down the sunroof (I ran out of daylight). This may sound really stupid, but should I open the sunroof and pour water directly into the channel? My goal is to see if I can actually find the source of the leak before slapping silicone in random locations all around my truck.

Have you tried the “puddle test”? I have been waiting for rain since having my trucks carpet and padding pulled out and replaced and random locations sealed. My case seems to be the only one from underneath that I have heard about so far. Like I have said in earlier posts, the real flooding that happened to me was when I drove through standing water.

I have thought of trying the fish tank method of finding the leak; seems easier than driving the thing into the lake and looking for bubbles.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by hummerNCO:
I have thought of trying the fish tank method of finding the leak; seems easier than driving the thing into the lake and looking for bubbles. </div></BLOCKQUOTE>

yo mang da best way to test fo dem leaks is da lake/ocean test. it don't matter if ya do it in salt water or in fresh water, just drive dat GM H2 into da largest body of water ya'll can find, wait until you be in dar far enough fo your air intake to take in water and den just put dat GM H2 in netural and floor it. da trick works every time mofo, trust me mang

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by BlingBlingH2:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by hummerNCO:
I have thought of trying the fish tank method of finding the leak; seems easier than driving the thing into the lake and looking for bubbles. </div></BLOCKQUOTE>

yo mang da best way to test fo dem leaks is da lake/ocean test. it don't matter if ya do it in salt water or in fresh water, just drive dat GM H2 into da largest body of water ya'll can find, wait until you be in dar far enough fo your air intake to take in water and den just put dat GM H2 in netural and floor it. da trick works every time mofo, trust me mang </div></BLOCKQUOTE>

Well, I'm not surprised they don't let you near the Hummer in the dealship! Why don't you keep putting together that scrap book of Hummer pictures and go back to school. One day you might find yourself a job at the local post office, boy...

Bling Bling:

Are you taking on water on the Brain?

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Hooked On Ebonics:

yo mang... blah blah blah (cannot translate) </div></BLOCKQUOTE>

Your aim is a little high and left. But you have the right idea

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by xonxoff:
Your aim is a little high and left. But you have the right idea </div></BLOCKQUOTE>That's ok, it'll take out the right side of his brain and he won't be so creative anymore.

Try the sunroof channel. You have nothing to lose doing it.<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by h2co-pilot:
Nice area you frequent, pimp that flop dizzle fo snizzle. Cuz ya skanked up get-up ya sportin' on da bones look like some 80's Flav-a-Flav sheat. And yo short- bitch look like Beetlejuice skrate trippin Midget. Skeet Skeet see ya on da skreet bizich. </div></BLOCKQUOTE>That's pretty damn funny.
"I speak jive". Florence Henderson, Airplane.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by xonxoff:
Your aim is a little high and left. But you have the right idea </div></BLOCKQUOTE>

That is only to compensate for the slight bullet drop and the mild left to right crosswind.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by hummerNCO:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by xonxoff:
Your aim is a little high and left. But you have the right idea </div></BLOCKQUOTE>

That is only to compensate for the slight bullet drop and the mild left to right crosswind. </div></BLOCKQUOTE>So, it's a 190gr Sierra at roughly a 300m shot with a 5 mph crosswind, temperature in the 80's and average humidity.

I always aim center mast then double tap. The muzzle climb usally puts the second shot between the eyes. That is if you wait for the respiratory pause before squeezing not pulling the trigger

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Mr. I - Man:
I always aim center mast then double tap. The muzzle climb usally puts the second shot between the eyes. That is if you wait for the respiratory pause before squeezing not pulling the trigger </div></BLOCKQUOTE>Awww...... how disappointing to hear that from a Marine. Remember "One shot, one kill." No point in wasting an unneeded round.

And center of mass is great for the average marksman, but to snipe, center of cranial mass is the shot.

I was always a M.O.U.T. Marine.

Hence, living deep in Chicago.

I never had urban training.

No, shoot him in the crotch. Then maybe he would speak english for a few.(it's probably located above the beltline of his jeans)

Nah I think its probably located between his belt line and sneaker.

UPDATE: Well I still have not put any silicone anywhere as of yet. But today, I opened up the sunroof and sprayed water directly into it. Nothing. Also, the water leak is not from underneath, because it leaks while sitting in my driveway. However, I did finally get it to leak when I sprayed water "near" the corner roof light. I know the rubber gromet makes a nice tight seal under that light, so I think that the leak is occurring under the exterior a-pillar body molding (that part that covers the driver's side edge of the windshield). I see that this piece is held in place with screws (maybe the leak is around these screws?), so does anyone know how to remove this molding? Also, I took the interior a-pillar trim off and it was nice and dry on the inside. I'm determined to get this fixed!!! :-)

One more quick question (in addition to the question in my previous post asking for help removing the exterior trim panel on the driver side edge of the windshield). Let's say that I am wrong about the water leaking from behind that exterior trim panel and that the water is really leaking from one or more of the three center roof lights. Wouldn't the water also travel down the a-pillar on the passenger side and soak the carpet over there? The dry carpet on the passenger side is one of the reasons why I have been thinking that it can't be the center roof lights. I really wish I had structural pictures of the H2 body before everything is put on it (windshield, dash, trim, etc.). I know I'm asking a lot, but your help is really, really appreciated!!!

I had the same problem, took it in and they said the problem was the front roof ligts. They repaced them and all of the carpeting front and rear.

After taking my car into the West Covina,CA dealer 5 times, the leaking into the carpet and insulation finally stopped. But I recently washed my car pretty thoroughly, and there was a small puddle of water not directly under the carpet, but right under the plastic trim.

I've submitted a complaint or whatever it's called with the Better Business Bureau and GM said they want to settle, but haven't called me back, so I'm waiting for the Better Business Bureau to go into an arbitration hearing.

I'm tired of this leaking problem, but I'll live.

Unlike most of you guys with brand new H2s, I bought mine one year used but with 33,000 miles on it, so the original GM warranty was over after I drove it 3,000 more miles. I had enough foresight to get a 6 year extended warranty, but that does not cover leaks...something I really didn't expect to have happen. Murphy's Law I guess. :-( And there's the other old saying: "buyer be ware".

Anyway, I have been able to successfully "control" the leak by routing the water around the front door hinges and wiring harness boot. (I used a concoction of weather stripping that I picked up at the local hardware store.) For a more permanent fix though, I just need to figure out a way to get my hands in there to spread some silicone around the hinges and the rubber boot. Anyone have any suggestions??? Is it easy to take the door off the vehicle so that I have more room to work?

I've decided to open up a lemon law suit with a lawyer, and since it will probably take a while, I'm going to continue to make some mods on my car.

-Sound System
-Lower (springs, shocks, torsion keys)
-Full tints
-Suede Headliner
-Already have 22" rims