My 95 Del Sol had a tiny leak, which I was finally was able to fix. Problem now is I have water somewhere! While driving I can hear it sloshing around. I'v gutted the trunk, interior and raised the car up in the air to check to see where its retaining water. it sounds like its in the panelling behind my seat, where the rear window rolls down... but i cant figure out where to drill a hole to drain it. Any ideas?

 

Don't just start drilling holes and hope that water will start draining out.

If I were you, I would take out all of the trim pieces in the rear and console and the seats and the carpeting. If that much water got in, you will probably want to replace your jute padding. (It's bonded to the underside of the carpet; I've never tried to get it off, but I bet that it can be done.) You can get about 12 sq ft of jute for like $10 at a local upholstry shop.

Next, to find the sloshing water -

I bet that the water is either in your doors, or in the wells to the side of the body in front of the RR wheel well. The seatbelt mechanisms are in the entrance to these areas. I would put your drivers seat back in, and then drive the car around. Perhaps you will be able to tell where the sloshing is coming from without all the junk in the way.

Idea - get out a hand vacuum pump, attach a catch canister and tube to it (the same one that you use for brake bleeding is fine.) Stick that tube down in the area where you think water is hiding and start pumping. Is water filling up the canister? Horay! You found the water, and you didn't have to drill!

If the water is in your door, it's probably because your window seal rubber has worn out. Time for new rubber.

Good Luck!

Oh - just reread your post.
You can remove that panel behind your seat to get to the RR window. Be careful not to remove too many bolts, I think the window regulator is attached to that panel.
Another idea came to mind - your fuel tank is near where you are hearing the sloshing. Does a full or empty tank make a difference in the sloshing?

 

Probably your drain tubes need to be cleaned. Very common problem with sols. There's tons of info on this including a How To: I don't have a link handy but with little effort, you should be able to find the info. Good Luck

 

Yea even if I have a full tank it sounds the same. Thank you for the info.

 

lmk if you find out how to drain the water. I have the exact same problem. The water is where the rear window rolls down into.