The sills have drains. There is air flow from the front windshield cowl down to the little vent doors in the side of the passenger and driver side footwells. Any water that enters the front cowl drains down through those vent passages and exits through the drain slots in the sills. There is no real forced air flow through the sills short of what might occur if there was a venturi effect associated with air movement across the drain openings when you are driving at speed.
The hole where I had water come out is actually higher than the sill drain holes. Water would have to fill up in the sills to reach the elevation of this hole and I know my sills drain just fine so (sill and door drains get a regular check) so the water is coming from some place else.
I will have to yank the air extractor drain tube out and use my endoscopic camera to see if I can figure out where the drain is supposed to go.
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