Passenger Floor Wet with AC

Well I think I have an issue with my truck because the passenger side carpet is very wet and warm.
It gives the truck a Musty smell which sucks. Anyone have any ideas? I was reading maybe the AC drain but couldn't find where it is.

 

Well I bought it used so it may be too late.
SO how would I kill it all?

 

I bought mine (2015) new & had this problem 1x and not since.

 

Bought my 2012 used and have had this issue a couple of times. Weathertech saved me from having wet carpet.

 

Same here, I would never had known I had a problem untill I smelled mildew & felt the carpet.

The puddle on the Weathertech's was a big WTF moment.

 

If it's not the drain stopped up, I would check...
The drain plugs in the floor (I had one in my 1st gen that was leaking and had to seal it up with bed liner spray) or...
If the 2nd gen has a wiring harness coming through the fire wall on that side it could have some dust around that boot which is causing a leak too (also had to seal up with bed liner spray on my 1st gen)...

 

Truck was new off the lot, no leaves or debre to clog anything.

 

Always a puddle under the truck when the AC is on