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Are you certain it is rain water? It could be condensation from the A/C coil that fails to drain out of the drain pan, or possibly coolant from a leaking heater core. If you are certain it is rain water, depending upon the age of the vehicle, and possibly some other things, here are the possible options:
Leaking door gasket.
Leaking windshield seal due to rust
Leaking windshield seal due to improper installation
Leaking windshield seal due to acoustic (sound) over pressure (if you have extreme sound system with heavy bass)
If you have a sunroof, if the drain hose comes down the passenger side door column, it could be leaking into the passenger compartment rather than drain through the floor pan.
Couple of spots to check - check rubber seal around door(s), check seal around windshield, and if equipped with sunroof, check the drain tubes (they get plugged and back up into cabin) An easy way to check for leaks - use compressed air around suspect points - have someone inside listening
windshield seals are usually not the problem: Here's the secret: There are 2 round rubber drains that are meant to get water away from that firewall: Yours are clogged!
The solution is simple: Open the hood, look to both the left and right of your blower fan (that's where your water was coming from, by the way), check both and I promise you, they are both blocked. Now take a long screw driver and push trough any leaves or gunk in there and then take a garden hose and spray it into both holes and voila! No more water inside Cabby!
Enjoy your dry Cabrio! Cheers!
There is a great possibilty that there is a leak on the Left Side of the Windshield. It is most likely in the area of the upper left side.
The reason for this conclusion is:
The rain water is coming in the Left Upper Side; and either coming down the "A" Pillar, or traveling underneath the trim on the inside roof and coming down the "B" Pillar.
The only other explanantion is a torn, worn, cracked or dislocated Weather Seal on one or both of the doors, allowing rain water to come in. Inspect very carefully these Weather Seals, especially on the top front portion of the rear door.
To help you locate these after a hard rain:
Take the trim panels off the "A: and "B" Pillars and the Roof Line above both Doors. Check for wetness underneath the trim. Or take these trim panels off, and place folded paper towels under the trim panels; reattach the trim panels and wait until it rains. Afterwhich, take these trim panel off and check the paper towels for wetness.
The Windshield Seal is easily inspected for cracks and tears.
Let me know if this helped, or if you have additional information or questions. Feel free to contact me at FixYa.com!
check seals around the door and the body where door closes, also check where windshield ends and firewall starts, could be small leak around any hoses or lines that go thru firewall, such as heater hoses and screw holes where parts are attached
Some leaks actually are from the windshield and it is contained by the trim so you can't see where it is leaking from. If it is the door seal look at the striker bolt to see if there is any abnormal wear. Make sure the striker bolt is aligned with the door striker. If you don't know how to check this run by your local body shop and ask them to check it for you. Sometimes if the keys have ever been locked in the vehicle people use door shims to hold the door open as to pick the lock. This is bad because it knocks the door out of alignment with the seals. Hope this helps.
4 things come to mind. 1.) has the car been wrecked and repaired, if so the doors may be out of adjustment.
2.) faulty door deals. the rubber seal that goes around the doors.
3.) a bad windshield installation or seal. if the windshield seal is bad it could allow water in at the top which could run between the cars metal roof and the fiberboard interior roof.
4.) bent doors
if the car has never been wrecked and the doors have never been removed then you can pretty much count out 1 and 4. check the door seals for tears or missing or flat sections. if they are intact then you may want to try pouring some water around the top of the windshield and check for leaks.
just some ideas. hope this helps, have a good day.