I need some help,

Does anybody know how you would get water in the floorboard?

I got in my truck after a bad rain the driver's side floorboard was soaking wet. After that about a week later another rain and the floorboard is wet again. I've not done anything to the truck or left the door open that i know of, any help will be appreciated.

Check the lights and OnStar anntenna on the roof for leakage.

Can be a front window seal or door seal. Also a sun roof might be a possiblility depending on the unit. I guess the only other option is go sit out in it in the rain or take a flashlight with you to the auto car wash and watch the floor board area. Might help to have friend look down there closer as well .

Brian

leak check with a garden hose?

do you have a sunroof? i do and gm forgot to hook up the drain hoses.

Have you had the windshield replaced before?

I know the feeling mine has a passenger side leak. Have tried everything and still cant find it. Water gathers around the passenger door area. Have ran a hose on everything and can't figure it out

most of the time the hose method can find it ..did you get a window replaced or is you door weatherstip old and wore out..

i have the same problem, any way to tell if it is the origional windshield?

My brother in law had a leak going into his Z71, it was coming in from the window wiper area and running into the cab. He just siliconed the bolts holding the wiper in place and no more water in cab. Just a thought. Chris

I had a 1990 GMC. I experienced the same problem. Rain and I would get water on the floor drivers side. I took a hose and slowly ran water over hood an every nook and crany I could find. YES, i did find. It was on one of the seams between the firewall and cab. RIght where you will find some sealant. I had to stand on my head inside to see, but I finally found. Seal with some RTV ( silicone) and it solved my leak. Very hard to find, but patients is the game.

It is the factory winsheld and it appears the weather stripping is fine. i'll try the water hose method

Probably winshield seal. had the same thing on my truck and when the stereo shop was installing pillar tweeters they siliconed it shut, and woola, fixed.

Had the same problem ended up being the drivers side cab light. I put some sealant under it and haven't had a problem since.

Look up under the dash and see if it is coming down from by the ebrake. I chased this down for a while about a year ago I think and finally ended up replacing the windsheild. It fixed it right away. Mine started from putting the bug deflector on and the trim around the windsheild started to make noise. I had the dash pretty much tore apart looking. I tried the hose etc. and couldn't find it. Put a new windsheild in and make sure to tell them to seal it up good and you will probably save yourself a ton of time.

I took mine in when it was less than a year old for a leak in the e-brake area. The dealer soaked it all day and couldn't find it (they did leave some great water spots though!)...so I readjusted the seals around the door and thought this fixed the problem since I didn't see any more water on my Husky Liners. Went out the other morning (2 years later now) after the truck had been sitting overnight in a heavy mist/dew and there it was again. Shined a flashlight up under the dash by the e-brake and OMG :eek:what an ugly rusted out mess in there. Apparently, it was leaking without making it to the floor...damn, damn, damn. It will go back to the dealer when I get to Tucson and can have it in the shop for awhile. It's under extended warranty, so I hope I'll get the damage repaired after they find the source of the leak and fix it. Like others have mentioned, all of my GM vehicles have had water leaks into the interior:mad:. Someone here mentioned that there's a Service Bulletin out on poorly sealed windshields, but no one has been able to get the number for me when I've asked. The dealer told me last week that he couldn't find the SB, but that doesn't hold much water with me...:p:

Seems to me there was a SB out when the 03-04 were new. I haven't seen it personally but remeber something about it. They had issues with getting the window seal to seal up. This is the only leak I had on mine.

Don't forget the rubber conduit from the door to A pillar that carries the wiring. Some have found it dislodged. Good luck.

I ordered a 2008 red Duramx LTZ with just about every option and took delivery in September. I had the Weathertech floor liners ready when I picked up the truck. They fit perfectly, by the way, and I figured they were the best way to protect my floors. Well, I lifted up the passenger side liner today and the carpet is soaking wet and moldy. I'm obviously getting in water from somewhere. Only 4 months old and 9000 miles, I expect GM to fix this one. Does anyone think I would be unreasonable to insist that the carpet and insulation that got wet be replaced, not just dried out? Otherwise, I love everything about this truck. This has got to be a one-off assembly line issue -- although it did not do a lot to boost my confidence in the GM QA when I got the mailer telling me that GM forgot to unkink the front axle breather tube and that I needed to take it in so the dealer could check the seals.

I ordered a 2008 red Duramx LTZ with just about every option and took delivery in September. I had the Weathertech floor liners ready when I picked up the truck. They fit perfectly, by the way, and I figured they were the best way to protect my floors. Well, I lifted up the passenger side liner today and the carpet is soaking wet and moldy. I'm obviously getting in water from somewhere. Only 4 months old and 9000 miles, I expect GM to fix this one. Does anyone think I would be unreasonable to insist that the carpet and insulation that got wet be replaced, not just dried out? Otherwise, I love everything about this truck. This has got to be a one-off assembly line issue -- although it did not do a lot to boost my confidence in the GM QA when I got the mailer telling me that GM forgot to unkink the front axle breather tube and that I needed to take it in so the dealer could check the seals.
When my ,then new, 1996 Yukon leaked that same way, they repaired the leak and then replaced the entire mat and carpet (the water is migrating to places well beyond where it feels wet). If I were you, I'd start off by telling them politely what you expect in the repair and that anything else will be unsatisfactory. Also, be willing to call the regional GM customer representative. Having done this, once again very politely, things will happen; been there, done that. Great to know that GM is upholding their tradition of built-in leaks:rolleyes:...No new GM products in my future - I'll stay with the old "leaker" that's paid for!!!

Thank you for the advice, Red04Rock. I will let everyone know how it turns out. I had to ask my dad to pick me up at the dealer after I drop this off tomorrow. He just bought a new Tundra. It hurt me to tell him why I had to go in. I've still got a 1980 Toyota 4WD pickup that has been through water over the hood and has NEVER leaked. I really am impressed, though, with everything GM has done with the new truck and the Duramax/Allison combination. I hope GM can hit its stride on reducing the manufacturing defects.

i have a 2008 lmm, and the driver door seems to be leaking between the window and the seals. watter is getting inside the door and leaking out the bottom. none is getting in the cab, but is this normal. should i take it to the stealer or is there even anything they can do. thanks for the replies

I have not taken the door panel off of this truck, but I have taken off plenty of door panels and all I have seen have a sheet of plastic just behind the interior door panel to keep moisture out of the passenger compartment and to protect the door trim. The door window "squeegees" that contact the window don't keep all the water out of the door. That's why the bottom of the door shell has drain holes. All the seals on the door and the door shell are deisgned taking into consideration that some water is going to flow into the interior of the door and must be drained out. The drains are going to send the water down to the exterior side of the door to body seal. Look underneath your door and check it out.

I had same issue. Long story, short, evaporator core housing was leaking.

Can check by pouring a little water into the air inlet opening located under the cowl.

Water from rain, carwash, etc. can get into the housing, as well as moisture that is generated while running AC. Normally drains out through the opening through the firewall, and drips harmlessly onto the ground. However, if the housing is not sealed good, then not all will drain off; some will find its way onto the passenger floorboard.

Good luck. I know from experience how frustrating it can be to trace down a water leak source.

I heard from the dealer today on the water leak in my new LMM. He says there were two places, several inches in length, where body panel sealant was missing. I think he said one was in the top passenger firewall area and the other was on the side passenger area toward fenderwell Either someone on the line was sloppy, or the robot ran out of sealant, or both. He assures me they will replace everything that needs replacing - and have already replaced the insulation. I told the service writer politely when I took it in that I assumed GM would replace the insulation and carpet and to please let me know if there was any hesitation about that. I responded to the "we'll make it right" assurance today with an offer to show up with 20 minutes notice to check out the truck before reassembly to be sure I was satisfied - since I'd hate to be dissatisfied after everything was back together. For anyone else out there with an 08, mine was ordered before the summer shutdown and was probably on the line in the first week or two after the 08s started production. (note to self - don't order early production again). I sure hope it is possible to get a good seal on the fix. I get the impression that this missing sealant should have been sandwiched between panels in the firewall/windshield drain assembly. If so, I'm not getting a great feeling on production quality. Here's hoping for the best.

Check for rat poop too. if you park outside they like to nest in your rig.

Check for rat poop too. if you park outside they like to nest in your rig.

Is there a way for them to get into the 900 trucks?

Picked up the truck today. Dealer had to take off passenger front fender and seal two areas missing sealant. It looks like it went back together fine and the dealer was kind enough to order new carpet - will call me when it comes in. It pays to have a good dealer. This one made me feel as good about the prodcut as possible after a faith- shaking manufacturer mistake.

Is there a way for them to get into the 900 trucks?

I meant mouse poo-poo. they can fit through spaces you wouldnt believe.
But a rat none the less can chew through steel. So i guess if a rat wanted inside your truck it wouldnt be hard for it to get in there.

I know this is an older post. Just wanted to post my findings about my leak. We ran water on the truck for about 30 minutes and finally found the leak. All though we dont know exactly where it is coming from. It dripps down the kick panel on the passenger floor area. At the bottom of the kick panel there is a square shapped area where the water collects and then spills over onto the floorboards. I took off the plastics and felt the drip inside the actual body by the kick panel. I siliconed everything (hinges, rubber boot for electrical ect.) It still leaks. My next guess is where the antenna cable enters the truck behind the fender. I am going to take the fender off and silicone it and anything else i can not get to. Where else could this be coming from in that area?

The glass, vent shroud under the wipers, window trim around front glass, the screws on the door trim. It could be making its way into the door pillar and then down. I would pull the shroud and take a look under there. Seems to me there were threads about that on the passanger side. Make sure also the drain on the firewall is clean also. Should look like a L shaped hose below the ac lines.

My truck was in the shop for two days last week to get this fixed (O'Rielly Chevrolet, Tucson, AZ). They tore the truck apart and began the water test that I told them it needed (a very, very slow and continuous flow of water). It was depaneled and they found two areas along the A pillar where the windshield had not been properly sealed at the factory and both were leaking. A windshield repair shop came and made the repairs, they let it cure for the prescribed time, and then leak tested it again (dry as a bone). I told my service advisor that I wanted to examine the vehicle while it was depaneled and after the last water test. Although there is some surface rust on unpainted items, nothing seems to have been damaged. They also lifted and inspected the carpets: no damage there either. I've had one good soaking rain since and no water could be found as I inspected it closely with my SureFire flashlight (bright enough to fry your eyeballs!). It would certainly have been much nicer if they'd found this and repaired it when I took the truck in for this problem on 2/15/2005!!!

My Buick Century had a similiar issue last summer.I did and tried everything until a neighbor mentioned the drains being blocked.They are located under the rocker panels near the front door pillar area.I have a habit of parking this seldom used car under a tree.The drains were loaded with leaves and tree junk.I blew the area out with an air compressor then used a heavy jet spray from a hose.The stuff that came out was unbelievabe havent had a problem since.

I had a leak and took some time to find. Soaked everything. What a mess.
It was the rubber seal between the door and jamb where the wires go from the door into the cab. It looks just fine but does not seal good against the metal. I just found it today and will glue it down.