gs300bk

I did find the drain holes in the front & ran some trimmer line down through it. The line did stop going in after a few feet. I thought it would just feed through until you saw it underneath the car. Also, I can see no drain holes in the rear of the sunroof area. Am I missing something? I live in Atlanta and after the recent torrential rains I now have the same problem - a driver's side rear floor that is soaked. I have a 99 GS 300. I located the sunroof front drain holes and one seemed to be plugged so I cleaned it and tested by running water in both the front holes- water drained and came out under the car. However, it just rained again and it seems I'm still getting water. I could not locate the rear holes- how do I get to those? Is it possible the rain is coming in from the A/C to the rear vent under the seat? This is where it seems to get wet. Thank you.