The sill is the most likely source, and there's certainly room and the length to slosh in. There are I think three little bulges along the projecting inner seam which are supposed to be hollow to let water drain out. A small knife is good for clearing them.
The sills can fill from the bottom of the A posts, which in turn can get water inside if the wax paper coverings inside over the apertures are torn or missing.
Some models, I think the earlier the earlier ones though, had removeable plugs at the front in the inner wall of the sill for access to the sill.
Of course water can get in anywhere if there are rust holes.
Watch out for water trapped in the floor underneath the metal plates in the footwells. Just because the carpets feel dry doesn't mean there isn't an inch of water sloshing about under the false floor.
|