I call it the vent plenum. It does let fresh
air into the car. It is supposed to have a couple drains, but they do
get plugged. However, that isn't your problem. It is remotely possible
that the seals where your windshield wiper parts pass through are
bad. If so, you are lucky. These are relatively easy to fix,
although while you are laying under there trying to do it, you will
exercise your vocabulary.
I would bet money
that your have a rust hole in there somewhere. Try laying on the floor and
have someone spary water in there to see where it comes from. You may end
up removing a bunch of stuff to be able to pack something up from the
under side to fill the hole. It may be at a panel joint, which is a lot
like chasing a roof leak. I am pretty sure that you will not be able
to reqch it from the top side.
John
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