I JUST got this fixed. At first, we resealed the box that collects the condensation, then we actually changed the box out (to the tune of $700 because Ford redesigned the box in '97). However, it was something else that needed to be sealed because my water leak occured when I had the defroster running and it was raining. I will have to check with my mechanic to see what finally sealed it. In your case, the box probably just needs to be resealed (which is what was done 5 years ago when I bought the car and it had that problem). If you know someone that can reseal it, I would see if that fixes the problem.
