I'm posting this for a friend of mine, who has a 2002 Bonneville SE, and she has been having problems with water leaking for quite some time. When she brought it to a dealer, they have found a few problems with the door seals and vapor locks, and then replaced them (three times on the fron driver'* side door, and once in the rear) The water has shorted out a couple of heated seat modules. She just had the car serviced, and they replaced the driver'* front seal and vapor lock. The last few times the problems would come back after 2-3 months. Is there maybe a greater problem than the seals and vapor locks that seem like replacing does nothing...? She thought that maybe it is coming in through the firewall, and I've also heard that it might be that the evaporator core is on its way out and leaking...? Wondering if this is an isolated incident, or if maybe someone else has had this problem or knows what the source of the problem might be. Thanks a lot. Any information is helpful.

everyone pretty much with a 2000+ bonneville has had an issue with the door seals.
and the evap core would have nothing to do with this, unless the drain is clogged and she runs the A/C constantly in HUMID conditions

After seeing the doors apart on Toasted, I'd say the vapor barrier is the likely culprit.

He ended up sealing his better with weatherstrip adhesive. Very gooey stuff that stays pliable.

Thanks for the information. We were curious as to if there was maybe another problem, becuase of the fact that the vapor barrier has been fixed/replaced something like 3 times, each time with the leak reocurring after a few months. It'* also interesting to know that there was a problem with 2000+ door seals.

if you have a moonroof, also check that. i have a 2000 ssei w/a moonroof and it continually leaks, there are four t screws that can adjust the height of the glass.

I have a leak also and believe its the sunroof/moonroof because its not flush with the roof when it closes. HOW? do you adjust the height at which it stops?

there are 4 hex screws underneath the sunroof glass if you look up at the frame of the sunroof. push the sunroof up in the rear and you will see the glass and the frame move up but the bolts will be in the same spot. push it up to the right height and tighten the screws down.

Jon

my moms car is having a similar problem. although her car does not have a sunroof and the door seals arent leaking there is always a lot of water standing in the pass. side. i took a look at it the other night and pulled the carpet back and its coming from the HVAC box under the dash but it only runs out bad when the car is facing up hill. i let it run for awhile facing down hill and no water leaking anywhere. sprayed down the doors and no water leaking inside that was noticeable, (plus we have been having a bad drought and it hasnt even been raining here). turn the car around facing up hill with a/c on and water started pouring in floor from hvac box under dash. i am supposed to take a look at it this weekend, didnt know if any of yall have had this before. she said that she didnt run the a/c one day and still had water in the floor (btw this is just water not coolant or anything from heater core) but i have a hard time believing my mom could ride around without air. any insight and guidance appreciated