Is my convertible leaking? 95 GT, Water everywhere! Options

[sh0x]

I have a 95 GT Convertible. I'm getting water in the rear driver's side cavity, where the rear quarter window rolls down into. It'll get so full it'll slosh around. Then it won't leak out, I have to stick a wet dry vac down there to suck it all out. Then it seems like if it gets too full it starts leaking onto the rear driver side floor, I had over an inch of water back there after a particularly bad storm. Killed a brand new $200 amp. But the passenger side is fine. Where should I look for this leak? Superficially everything looks fine. Thanks in advance for your help!

[Velliety]

Mine has that too, drivers side only. The only thing I can figure out is that there are drain holes somewhere so the water should be able to drain out, but I guess that my driver's one got plugged with something. I can't find the drain hole itself to get the junk out of it.

Samantha