Why is my back seat wet

Hello, If you drive on dirt roads or through mud it is very easy to clog the drain for the A/C evaporator housing in the front or rear. You'll want to either search though the fender well to find drain, power wash there and under the truck, and possibly remove the rear seat the and side panel to expose the evaporator housing, locate the line (not in my diagrams) and allow 'snake' the line until it starts gushing water onto the ground. NC gets hot and humid, and that means the more you run the rear A/C the more it will build up water. A/C units remove heat and moisture from the vehicle. A suggestion is to do the same with the front. If you cannot penetrate the drain for the evaporator housing, you may have a dirt dobber nest on it.