I checked the passenger side floor when I bought the car last year,
and it was dry. I believe it stayed dry over the Winter, but after a few
weeks of frequent rain, I smelled mildew last week, and sure enough, the
front passenger floor was wet. Not soaked, but that was the source of
the mildew. I know about the issue with the firewall seam possibly not
having been sealed correctly, but if that's the case, how do I fix the
problem?