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Pontiac Bonneville Water Leaks



  • destiny5destiny5 Posts: 2
    I have a 2004 pontiac bonneville and recently I have been getting water on the floorboard behind the driver and now on the drivers floor. My son checked it out and says the water is coming in by the emergency brake wall.. And it only does this if it is sitting in my driveway front wards. If I park it on the flat or back it in the water doesn't come in when it rains. But I also noticed I have a wet spot on the drivers floor. I NEED HELP. I don't have a sunroof and my son check my windshield for leaks. Can you please help me.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    The water has to be coming in around the door rubber seals or coming through the inside of the door and getting past the water shield that's caulked to the metal frame to direct water inside the door to the drains at the bottom (which drain it outside the rubber seals).

    Run water onto the windows with a garden hose with no nozzle and look for drips coming on the inside of the metal showing around the bottom below the inside fancy covering.

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  • najinskinajinski Posts: 1
    I have a 2005 Bonneville with leaking problems. I do not have a sunroof. I have seen leaking once when sitting at the airport, I saw water coming in on the kick panel in the center of the front door. I opened the door and couldn't find any indication of where the water was coming from. The seals look good. Can you send pictures of the inside door seal? Thanks,
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    Check your carspace mailbox for some help.

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  • sherrillbsherrillb Posts: 1
    I have a 2003 Bonneville and it also leaks behind the drivers seat. The leak is pretty bad. Can someone email me pictures of the location on the drivers door.
  • david777david777 Posts: 1
    I have a 2001 Pontiac Bonneville and have water leaking on the inside of the doors and onto the floor. Can anyone provide me the instructions and hopefully pictures of the proper procedure to remove the driver and passenger door panels without breaking clips and hurting electical wires. Also what do I need to do to fix the water leak problem?
  • rsheederrsheeder Posts: 1
    I own a 2000 Bonneville SE that has recently been leaking large amounts of water on the front passenger side floor. This problem has just started in the past month or so, and I have no clue how to fix the problem. Every time it rains, though, I get water on the floor. I have checked the door and can not find the source of the leak, although a subtle water trail has appeared on the plastic that lines the door jam. The trail looks to be in the area underneath the speaker. My trunk has also leaked, but that has only happened one time a couple of months ago. I'm not sure if the problems are related. I noticed people had sent photos of how to fix the problem. If someone could do the same for me, or at least provide me with more information on how to fix this problem, it would be greatly appreciated!
  • rocky74rocky74 Posts: 15
    I have a '97 Bonneville with a water problem, also. The carpet in the back seat gets soaked. There is no sunroof. Could you please let me know what the fix is? I tried to set up my page here, but it isn't loading. Maybe you could post it since so many of us have the same problem? Thanks
  • rklusrklus Posts: 1
    Hi, I have a 2002 Bonneville that is leaking very similarly to those posted here. Water is pooling on the floor behind the driver's seat. No sunroof. Can you also send me the information on possible fixes?


  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713

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  • vapor29vapor29 Posts: 1
    Hi, looks like I'm having a similar problem. Mine doesn't appear to be from rain though. My 02' Bonne has begun dumping massive amounts of water into the passenger side floor when I run the A/c and make left hand turns. Any help, picture, etc would be appreciated.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    Since you don't mention water from the outside like rain, yours sounds like the drain on the AC evaporator is stopped up. Put the car up on blocks or a lift or something solid and crawl under. On the firewall down low you should find a tube that's the drain to the AC box. It will have a flattened end to keep it closed except when water weight inside pushes through.

    Insert a coat hanger into the bottom end and you'll probably get a gush of stuff coming out that was blocking it.

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  • kts0347kts0347 Posts: 44
    Hi imidazol97,

    You have given some great advice.

    I have a 2002 Bonneville with sunroof, and have water leaks under passenger seat and rear floor. I dropped the headliner (it needed to come out anyway for recovering) and blew out the four drain hoses on sunroof. They were all blocked. The two rear tubes exit just in front of the rear wheels and the two front ones appear to dump into the lower door sill and then drain out from there. Now they all run fine except the driver's front side. (I test poured water down the tubes to check) Nothing is coming out, and there is dampness on the emergency brake cable and wiring harness. Another post indicated this tube could be misrouted, but I can't find where the tube is behind the instrument panel. Can you help.

    Also, I think I have one door inner seal that must be leaking too. Can you send info on that as well.

  • kts0347kts0347 Posts: 44

    I have a problem with the sun roof drain tube on my driver's side front too. It doesn't seem to be draining to the outside. I blew it out with an airhose, and it is clear - that isn't the problem. I ran water down it as a test, and it disappeared - it just didn't come out the bottom of the car like the other three tubes did when I tested them. I pulled up the carpet partially and found seepage on the parking brake cable and wiring harness. But I didn't find the drain tube. There is a heavy rubber mat under the carpet on the firewall that is held down with pins. Do I have to lift that to find the tube, or how do I determine if the tube is positioned properly?

    Thanks for the help.
  • kts0347kts0347 Posts: 44
    Hi imidazol97
    I am a newby on the site, and have a number of Pontiac Bonneville water leak issues. I tried to find your picture-rich help guide for drain tube repairs but didn't have any luck. I went to your carspace but didn't see a link to the guide. Help!!

  • 05gxp4605gxp46 Posts: 1
    hi out there, has anyone else had water leaking into their trunks? i have an 05 bonneville gxp and every time it rains i get water in the trunk and it pools up in the basin where the spare tire sits.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    Check your carspace email box.

    This message has been approved.

  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,713
    >heavy rubber mat under the carpet

    It looks like you have to find the right place to cut a chunk out of that mat to find the place where the tube goes through and out behind the front wheel inside the wheelwell housing.

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  • kts0347kts0347 Posts: 44
    I found a very detailed posting of how to repair the sunroof drain tubes. The front tubes are the most McGivered devices you can imagine. Instead of being one continuous tube, they are sectioned and joined behind a heavy rubber mat that is pinned to the firewall (underneath the carpet). As soon as you blow out the tubes to clear them, they separate at this section. The only way to access the location where the joint is located, is by cutting an access flap into the heavy rubber mat. The detailed posting with very clear pictures showing how this is done is unfortunately not in this forum. you can find it at ( Study the pics carefully to figure out where to cut the access flaps. On the driver's side, you will have to remove the parking brake. And use a hose clamp so they don't come off again. Agggg!

    Unhapping ending: Before I found this post, all I knew was that the water was draining behind the heavy rubber mat rather than outside. It was a black box mystery - because you simply can't remove the mat to inspect. And without knowledge or a shop manual you are lost. So, I finally gave up and took my car to the dealer. They charged me 3 hours labor so you know this isn't an easy job and they ended up slicing the mat just like the posting describes. A day later I found this posting with the clear pics. Turns out I had already done most of the work.

    Another tip. the underside of the carpet is coated with a thick foam material that really sponges up the water. So don't expect that it is going to dry by itself. The best solution is to remove the carpet and sun dry it, reverse side up (per the Pontiac Tech) but what I am trying is to create an airspace by placing some plastic bottles under the carpet and sqeezing the foam like you would wring out a sponge. I figure that with AC on, it will eventually dry if you allow the air to circulate. Also, park on a sloped driveway, with the back end downhill ( keep your rear carpet elevated off the floorboard) Gravity will pull the water toward the back seat floorboard area where you can mop it out. And keep wringing the foam on the back floor carpet. It will get fresh water in it, as it runs down hill. A few days of this will get rid of most of the water. The Pontiac Tech tells me that the carpet doesn't like to naturally wick the water out of the foam to the surface, so don't expect it to just dry out by itself. You will be shocked at how much water wrings out of the foam. It can absorb well over a quart on each side.
  • Same problem with water leaks in the door. Can you also send me pictures of the inside of the door and instructions on how to remove the door without damagaing the clips? Thanks.
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