Question about 2004 Pontiac Montana

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2004 montana leaks driver and passenger. thought it was windshield got new one and seals. then tore up carpet and saw when a/c was on it dripped inside. took van to oil change place and they couldn't find the hose. I'm thinking it is missing (hose) and that is why it is leaking in front. need diagrams to find hose or know they are missing

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I had the same problem w/ my 2004 Montana. It is the condensate dripping down the firewall inside the cabin. The drain hose fell off and the little plastic drain piece doesn't direct water away from the vehicle. It is located on the right side. The other issue you will soon have is electrcal shorts. Because there is a large wiring harness under the passenger carpet. The connections are just taped together and will corrode.This will cause issues like the rear vent windows, electronic load leveler to stop working. You will need to untape the harness and splice the wires together again.

Posted on Jul 21, 2010

Testimonial: "Took to dealer and the drain was all backed up. They suggested that I also keep the filter inside clean. It is still condensing (leaking) inside."

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Hi this actually does not sound like the a/c this sounds more like the matrix inside the dash, this is the little "radiator" that either heats the car or cools the car (a/c) when fan motor is switched on, i am surprised the the oil change place did not tell you that this could be the cause, if you had an air-con leak into the vehicle this would not be water it would be gas, as a/c's are full of freon gas, and not water, so i would investigate a bit more and find out if it is the matrix ( internal rad ) under the dashboard rather than the air-con...hope this helps

Posted on Jun 05, 2010

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1 Answer

My car gets super humid inside and water drips over the dashboard. why is that?


Check your carpets, I bet you have a leak. If the passenger floor is wet and smells like antifreeze you probably have a leak in your heater core. If it is wet other places and just smells like musty water I would look for a leak in that vicinity (windshield, back window, door seal)

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I think I answered this last week!

Only when it rains?

Check user carpet for holes in the floor. Check rubber grommets coming through the firewall. Check sealing on the bottom and sides of windshield.

Whether it is raining or not?

Check for leaks from the heater core or hoses, or the heater control on the dash.

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If silicon is working,I would go with it,silicone last a long time and it's working.

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a couple things to look at if it has a sunroof the sun roof would have drain hoses that run down in each corner next you need to look at the cowl this is the section in front of the windshield that has a drain on it as well if you find nothing there the next step would be to remove the seats and carpet and sit in the car while running water over it either way you should remove the carpet and make sure it is dry all the way threw or mold will start to grow and you will never get ride of it not good for your heath other key spots to look at is if the windshield was ever replaced it could be a poor seal

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2005 v50 When it rains my car fills with water. It has happened on the driver and passenger side and under the seats. I saw water dripping from the glove box area.


Check all the seals around your windows and doors. Leaks could seep in through there drips at a time and fill the seats. also check the seals around your front windsheild.

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I would say you have either a bad seal on the windshield or the seal on the passenger door opening.

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If you are sure it's not the door seals, I would take it back to whoever replaced the windshield.

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Erm windshield not fitted properly. Take it up with the company who replaced them. The seals around the shield may have been distorted when glass was replaced. New seals should do the trick.
If cost is a problem a little rubber weld at the right point if you can locate it will stop the damp

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3 Answers

Pontiac Montana 2004 Leak


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

Nov 19, 2008 | 2004 Pontiac Montana

2 Answers

There is a water leak somewhere in my 98 toyota camry that leaks into my passenger side floor. There is no sun roof and no visible leaks from the windows or doors. Any thoughts? A/C leak maybe? water...


I am the original owner of camry xle 1998 with wet floors. In 2000 I had drivers side door seal leaking at welt. Removed old door seal and new weather strip on drivers side installed. The door panel was never wet, but wet at bottom of door where there are drain holes...slowly leaking under carpet.
In 2001 later water again. Coming from overflowing A/C evaporator-drain plugged/ tank full of debris. Removed evaporator, cleaned + drain cleaned.
In 2003, driver door seal against window rotted. Removed door panel and found leak at window belt molding at the mirror joint inside + out. Lots of mold under carpet needed to replace! Made a fuss at dealers for reacurring problem and they replaced the carpet for free.

Sep 07, 2008 | 1999 Toyota Camry

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