Question about 2004 Pontiac Montana

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Pontiac Montana 2004 Leak

I have a leak somewhere that ends up on the drivers side floor. When ever it rains or wash the van it happens. I lifted the carpet and started putting towels there to soak up the water. I noticed that the towel first gets wet up where the heat would come out area. With winter coming on, this rain/water will turn into ice and since there is wires going up the left side of the floor and getting worried about it.

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  • Darryl Boutilier Nov 19, 2008

    Thanks for the reply, raining all day today and called for tomorrow as well but when I do get a chance to do this, I will check and leave an answer, thx again.

  • Bcakes69 Feb 08, 2009

    I have a 2005 montana (not SV6), and I took off the upper dash panel and both "A" pillar panels, and tried to see where the water was coming in by using a garden hose, without any luck. I sealed up as much outside weather stripping as possible, but the water still comes in when it rains...I have a mechanic background, and I am frustrated as to where it's coming from. I have red similar complaints online, but have yet to find anything tangible. 
    I will never buy another GM product due to this, and many other  problems!

  • Bcakes69 May 11, 2010

    Thanks for all the input, I'll try all of the above when the temperature is above freezing... I live in Montreal, Canada and will have to wait until the end of March, or April sometime. Thanks again.

  • Clyde Walters Oct 30, 2012

    I started to say thanks for sharing onthe leaking Montana. I have the same problem and traced it ack to a poor windshield seal. Check the upper part of the windshield metal and you will find that the metal under the rubber is rusted and bubbling. This causes the seal to lift and water to get into the A pillars and the centre console inside. I know of GM replacing the roof sections when under warranty, but after 5 years the warranty is done and you are stuck with the problem. I don't have a solution for you, except buyer beware. I can see myself buying another GM unless someone breaks my arm.



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I turned on the fan inside and closed everything up, went outside and poured soapy water around everywhere. I found bubbles at the mirrors and and the top of the windshield. Also a "Tech" told me that under the door rubber at the driver and passenger sides there is a piece of tape that is supposed to cover two assembly holes on either side but doesn't, so I caulked it and solved the leak that comes out the map lights. I also found that there was a crack in the sealer along the firewall to passenger inside fender allowing water to collect int the wiring channel causing the dreaded "lock" problem, which I had fixed by the dealer but they didn't fix the leak. The dealers and "Jet-set Execs"are the reason GM is hurting as their vans are OK. The fix was spraying RV Roof\Gutter sealant from the front after removing the wiper cover and spraying waaay in. Now I need to fix the one on the front that comes in above the passengers left foot and makes a spiders haven behind the centre cowl. Jim

Posted on Mar 04, 2009

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I went to get a chip fixed at Autoglass Specialists today. The gentleman that did the glass repair said he had a Montana and it leaked from the roof rack. The water runs forward and pools at the top of the window and stars i rusting. He loosened up the srews. We were lucky and the blue locktite didn't tear out the screw bosses in the thin shet metal of the roof. He cleaned and applied urethane caulk. The dabs were about 1/8" thick an about a nickle diameter size. He said on his van he just removed the roof rack completely and selaed the holes. That solved his problem. We''l have to wait for the next rain storm after winter to find out on ours.

Posted on Feb 11, 2012

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Hi. You have a water leak in or around the windshield and or vent somewhere in the front. Pull back the carpet where you know the leak is and then while you watch, have someone spray down the front end of you car. Watch for the water to start leaking in, then trace it to its source. If it is an area around the windshield or molding, the leak can be sealed with silcone. If its a open vent, repair accordingly.

Posted on Nov 19, 2008

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