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When I first saw those drain holes, it was because a small leaf had made its way in through the hood grille, down the channel (it's like 3 x 4 in) and into the rocker panel. Then it was rain-drained towards one of the holes but wouldn't fit through, so the pointy end just hung out there for me to see.
Otherwise I wouldn't have ever seen them.
Along the bottom of the rocker panel is a wide weld part. Every so many inches that weld strip is not welded, the two parts are formed apart, and that's the drain. Easily found while lying under the car for some reason, like an oil change (when you inspect other things, right?).
I have see on the board that a good way to clear out the glotch that gets in there is with a vacuum cleaner, and the panel opened up by pullling out those plastic covers. They are about 2 inch diameter.
In addition, the larger square panel on which the lower front seat belt anchor bolt is mounted can be removed and the vacuum nozzle stuck in there.
When the carpet gets wet, the water might seem to evaporate. NOT. It can get into the foam padding, which has a rubber scrim on the top side so water cannot evaporate. By the time you can smell the mold/mildew, the water may have rusted a drain hole in the floorboard, or flowed through the side channels into the rear foot wells where it will start rusting, too.
Pull the seats and carpets and pads. I did that, and ran with a set of plastic floor trays sitting on top of about 15 - 20 layers of old newspapers. Rather noisy, and the water still got in, but I could keep the inside pretty dry by changing out the papers until I could fix the leak and dry the pads and carpet.
Good Luck,
Bob
:>)
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