So after months of trying to figure out how water is coming into the passenger area in my Mustang, and after reading HUNDREDS of posts on this and other forums, I dedicated today to fixing this fucking problem. I thought it might take all day, but I figured it out pretty quick.
I left this morning for some breakfast, and since we had hard rain last night I knew I'd see some leaking... not as much as I got (probably 40 - 50 ounces, and yes, I am serious). So I got out the towel I carry with me, soaked it all up, wrang it out, soaked it up, wrang it out (you get the idea). So I get back home, rip off my cowl, and start taking pictures to see what it might be. I was pretty shocked to see a pool of fucking water where the cabin air filter goes (see pictures below).
I got all the water out (just soaked it up with rag) and looked down there and saw this grommet looking thing totally caked up with gunk. I pulled it out and saw there was a slit at the bottom, so apparently it WAS designed to drain water, but since the slit it so small, and so much shit got backed up into it, it was making the water back up. And as you see, my cabin filter is fucking disgusting now, so I have to order another one of those.
So here is a big
to Ford for such a shitty design and not helping people whose cars are still under warranty.
I hope this helps anyone that is having this problem. I'm going to link this to a few other sites (mustangforums has the most people complaining about this), and hopefully we can all enjoy dry floorboards now!!!
(note the slugde in the grass that came out of the grommet thing)