Not sure why I waited so long to look into this. Mine was leaking behind the passenger kick panel. Was doing it while the truck was parked for some time so the carpet & jute had all been soaked. Passenger floor pan now needs replaced (so much for my rust-free desert truck) but since it had holes in it for drainage, I never prioritized fixing the leak. Plus it's been parked in my garage the last year so no rush. I just removed the cowl panel and around the hood hinge deflectors I had a bunch of leaves and dirt and gunk piled up. This wasn't letting the water drain between the outer & inner fender so it would pool and then drain through the hood hinge. The hood hinge drops into the cab and the water will go right into your kick panel if it makes it inside the hinge deflector. I gave everything a thorough cleaning and made sure there were no clogs between the outer & inner fender. Problem solved. When the interior goes back in, I've read here and elsewhere to seal the kick panel well. Hope that works!