I have a 2001 Tahoe and the carpet on the drivers side seems to always be wet. We have some rain lately, but even when the weather was good it still seemed to be damp. What can cause this to happen? I did google it and others have had bad/clogged drains and also plugged drain for the A/C. How can I check these things? Really don't want the floor board to rust out; thanks in advance.