2015 GMC Denali wet passenger side floorboard 

While cleaning my truck, I noticed the passenger side floorboard was soaked. We recently had some severe rain.
I removed windshield wipers that are attached with a 15 mm nut, then removes the 6 push pins that hold the black cowl in place. Remove cowl.
Right below the windshield on the passenger side is a glued in access panel for the fresh air intake.
The glue had come lose, allowing water to fall directly into the intake, thus, dripping on the floorboard.
I used lexel caulk to reseal.