On most vehicles, if you have wet carpet from a clogged condensate drain, all you do is find the drain on the firewall, and clear the blockage. If you own a 1993 - 1996 Jeep Grand Cherokee, it may not be that easy.
This post from Gary Harrison describes how you can clean the condensate drain on that 93-96 Grand Cherokee.
http://www.aircondition.com/wwwboard/2002Q1/76396.html
Here are some photos of the drain http://www.aircondition.com/wwwboard/2002Q1/76414.html