I did a search without luck so I guess I will post a new thread on this. I have a serious water (rain) leak on the front driver side. If we get an all day rain I have a huge puddle of water in the front driver side floor. This is a serious leak and I am wanting to know the most likely areas for this leak. My first guess is that it is most likely the air vent on the drivers side. This water comes in with the car sitting in the driveway; it is not highway splash, it is water falling on the car when it rains.

I also get water in the back passenger (right) side that I am guessing is coming in around the door seals but it is hard to tell. What could that be other than the door seal; again this is with the car sitting in the drive on a rainy day.

Does your car have a sunroof? If so, we can explain how to determine if the leak is coming from the sunroof drain tubes.

Most likely cause is the watershield in the door panel. If you remove the inner door trim panel there will be a sheet of plastic stuck to the door sheet metal. This channels water that enters the door down to drain holes in the bottom that are outside the weatherseal. The adhesive used to stick the plastic sheet on the sheet metal can dry out causing seperations, and leaks. Very common failure.

Finding water leaks is often a process of elimination. The above two would be where I would start.

By the way, the water in the back sear foot well is probably coming from the front seat area.

Have you took out the spare tire in the trunk, and made sure no water is pooling up there also?

No sunroof. OK, first line of attack is to remove door panel and check that plastic sheet.

But the water in the back foot well is on the opposite side from the front. Is the same plastic sheet applied to the back doors as well? The back foot well gets fairly wet as well but the front passenger side is dry.

This leak has been an issue for awhile now but has gotten worst. Of the times I had the spare tyre out, I have never seen water in the tyre well.

A tip that may help, when you remove the door panel, you can get somebody to hold a water hose over top of the door, and while you sit inside watch for any water to leak in.

All four doors have the same plastic sheet. If you do remove the trim panel and find the sheet has seperated, this is the stuff you want to get:

1 4" Round 3M Auto Glass Butyl Tape Windshield Rear Window | eBay

Here it is in tube form:

Surebond Skylight Window Butyl Sealant SB 140 | eBay

You should be able to find it at a store that sells auto body repair materials.

You don't have to take the door apart......open the door, and make sure the primary seal is intact, all around the opening...to check the rr door, remove the lower half of the rear seat....remove the plastic door sill below the door....move the front passenger seat, all the way forward....now pull the carpeting away from the door(if you have a lot of water underneath the carpeting, you should seriously think of removing both front seats and taking the carpeting completely out, or a mildew smell will be created).......while sitting in the back with a flashlight and the carpeting away from the door, have someone hose down the outside of the door, if water comes in from the bottom trim of the door, then that inner water seal of the door is leaking....

Basically the same for the lf door....check primary seal, move driver'* seat all the way back, remove sill, peel carpet back from the brake/accel pedals and also from lf door....get inside with a flashlight....have someone hose down just the door...if no leak, hose down the windshield area....

If the car ever had a window motor, window regulator, window, door actuator, door latch, or front/rear guide replaced, if that water seal was damaged or not properly reinstalled, that water seal will leak....

If this is my car, and the carpeting is really wet underneath, I remove the carpeting from the car....then I wet down the WHOLE car, to see if there is more than one leak before I put that dried out carpet back in....

I have pulled the carpet back to see but I am not understanding how water can enter from the door? If water enters the door by the window glass I would think it would flow out the drain holes in the bottom of the door which are open. To my knowledge, I don;t recall the door itself being wet, just the carpet. However, I will go ahead and remove the door panel, I have my GM service manual, and check the water shield. Maybe just work from one thing to another to try and stop the water infiltration and hope for the best.

To Gus' point, while I still think the problem is the watershield, before you pull the door trim panels off check the primary seal first. This is the soft rubber seal you see when you open the door.