My truck is a 06 silverado with 10,000 miles on it...just to let you know how new it is and I have a little problem. Everytime and clean my truck and get ready to vaccum out my floors when I pull the floor mats out my carpet is always wet under it.. Now I know what most of you are thinking..HEATER CORE.. But actually its wet in a 12 inch circle right in the middle of the passenger floor, and its completly dry everywhere else?? Odd placement i agree! Has anyone had this problem?

 

Now that is weird... cause i dont think there is a plug under the cab...

Is yours a Regular cab or Ext cab?

 

your a/c drain might be stopped up, but with 10k miles, to the dealer i would go.....

 

Grumpy is right...with that milage us GM dealers will warranty fix it. But in all reality I'd say your A/C evaporator drain tube is stopped up....it happens quite frequently.

 

10k miles-warranty.
bring it to the dealership.

 

10,000miles???? and your not taking it to the dealer for what reason?? sounds like it could be a plugged up evap drain like the others have said or a multitude of other things...leaking hvac case.....water leak..Ive seen leaks from the door pillars where the wiring grommet isnt seated properly