I recently bought a 1994 850 wagon. After a day of driving in rainy weather and moderate use of the defroster I noticed the floorboard on the passenger side was saturated. The water seems to be clean water with no coolant. The condensation drain tubes are free of clogs. There are no holes in the floor. The sunroof drains are clear. I cant think of anything else to check. Any advise would be appreciated.

 

Condensation drain tubes? Are you talking about the tubes in the engine compartment that drain the plastic tray under the windshield wipers? If not, I'd check those, and then check the tray for cracks or holes.