The front drain holes for the SR are easy to spot in the left and right corners. The rear can only be accessed by removing the sunroof.
If you hear water sloshing up front, it must be by the fan. If I remember correctly, there is a drain tube under the fan box to the bottom of the car. You do not have a cabin filter, do you? Otherwise, you would know what these guys are talking about. The cover under the hood, below the windshield, is held down by some Torx screws. This cover has 2 drain tubes to let water out, and leaves and pine needles clog these tubes. Each tube is about 1 inch in diameter. You can use a coathanger to get them clean and working.
The water under the blower is a little harder to get to, but you need to find out why it collected there.

Klaus
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1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi