I have a 2001 Honda Accord LX-V6 4Doors, well I noticed that the floor mats for back seats were completely wet. It haven't been Raining, It is cold at here so I assume that I must have a a/c leak due to I turned on my heater to defrost the Windows... Question is, is there any a/c hose going to the back seats that is causing...

 

If front pax side carpet in foot area is dry, the leak is not from AC drain which on the firewall near the pax feet.

If car doesn't have a moon roof, the leak is likely a door seal that has damaged seals and allowed rainwater in some time earlier and you only noticed recently.

good luck