Water sloshing in my rearwell???

assuming a convertible -- the sloshing of water is in the rails along the side of the car. Water drains off the convertible top and down to the rails that run on both sides from the front tire to the back tire. there are drain holes in the bottom of these rails that get clogged up. Lay on your back and look up under the rail and you will se 3 or 4 clogged opening on the seem. Hammer a screwdriver in the holes to open them up and the water will run out. leave these "open" these are the drains. If you can get the openings to unclog -- drill a few 1/4 inch holes along the bottom of the rails.

Make sure the top drains are clear. Pull out the rear trunk floor and you should se the drains in the corners of the trunk, remove the drain bungs if you need to let the water drain out and leave the trunk open for a while to let the trunk "air out".

There are holes under the car under the rocker panel. Just blow these out. (I used a stick to clean out the drain holes) but my car does not fill up with water anymore. Whenever you have your car up on a lift or anything, always make sure these holes are clear to prevent the car from filling up with water again.