I have a 2015 Silverado 2500. Water is leaking in the passenger side floor board of the truck. I suspect the air conditioner is not leaking to the outside like it should and into the truck. I'm currently trying to dry the inside out and while I'm doing this can anyone tell me if you have had this problem before and what to do about it? Thanks!

 

Its not the air conditioner. Vent is open and clear.

 

I have come to the conclusion that my windshield is leaking.

 

You should also inspect the seal around the 3rd brake light. Remove the light and look for signs that water has been running into the cab from there.

 

The leak is coming from the XM radio-satellite shark fin antenna on top of the cab. It is a known issue. It happened on my 2014 just recently and i thought it was the window that was recently replaced as well. Safelite pulled the molding in the cab and showed me the leak. I did not feel like pulling the cab apart to get to it so I put a bead of black 3M marine sealant sealant around the shark fin, no more leak. If may also be the rear break light which is also as common as the shark-fin. Bead of silicone will fix that issue as well.