Your rocker panels should have functional drains along the "rails" underneath. Most likely they have been bashed and/or pinched shut (from running the car over something, or from improper jacking) and/or plugged by debris/dirt. If the drains are pinched shut, I would recommend opening them back up as needed by prying with a screwdriver, etc. Then run something skinny, like a welding rod, up through the drain into the cavity to break free any dirt or debris that may be causing the clog. As for where the water is coming from, I can't remember where the water that is supposed to drain out there comes from. I remember after heavy rains freeing up my rocker drains and water immediately came pouring out.
If there is any evidence of water getting into the interior of your car, I would check the seal of the vapor barriers behind your interior door panels however. To do this, remove the interior door panels to expose the vapor barriers and look for areas especially around the bottom where the seal is not intact. Dust/dirt trail will belie the existence of water escape paths.
Not a bad idea to make sure the drains along the bottom of your door are working as well. Test them by hosing down your window with water, letting it flow down between glass and outer glass scraper. Make sure all of the door drains are flowing water when there is a lot of water getting inside the door.
Topic: How can water fill up my rocker panel? (Read 3932 times)
