Wet passenger floor after AC usage

[sittnick]

This is my second B Body wagon ('94 Roadmaster), and both of them have had a problem with wet carpet under the passenger side carpet. My '94 Caprice had it much worse, where the moisture went all the way to soak the second row passenger side. AC works fine. Anyway to reduce/eliminate the condensation or whatever it is that makes the carpet so wet?

 

[txbarney]

You apparently have already figured out what the problem is and where the water is coming from. Not being a owner of that vehicle, I cannot tell you if it is a common problem but the simple answer is that either the drain is plugged and/or the seal on the passanger side of the A/C duct is leaking. You might need to pull the carpet back, first to help it dry and with the carpet out of the way, you can see exactly where it is coming from.
It is not uncommon for the duct work to have condensation on the outside but that is usually an annoying drip on your feet....not flooding the floor.

 

[sittnick]

Well, I took the car into the local Buick dealership. They said:

Checked A/C drain, the drain is was already open water coming from the drain. Pressurized the over flow tank would not hold pressure did not find leak at this time of service.

I should mention that during our mild/short winters in southern Georgia the heat did not work, but I attributed that to a bad actuator door. While the expansion tank may be empty, I am not losing enough fluid to make the car run hot. Strange.

 

[mikethebike]

I put a curved hose on drain & stopped that. wind blows it back in box

 

[HotZ28]

"Checked A/C drain, the drain is was already open water coming from the drain. Pressurized the over flow tank would not hold pressure did not find leak at this time of service." Num-Nut's service from that dealer! I hope you did not lose too much money there! What does the liquid in the floor smell like, or feel like??

 

[RMSWFAN]

I had the same issue when I owned a '94 SW. All these cars come with a hose that connects to the drain protruding through the firewall; this hose curves down towards the ground. Without this hose in place, the dripping water will follow the small protruding pipe back through the fire wall to the inside and under the carpet. The way I found out this curved rubber hose fell out is when the rear passenger carpet felt like a water bed. I suspect that over time the hose gets hard and falls off; I put a new hose and a tie rap to further secure it in place.

 

[sittnick]

Turns out the cause was a rotted out heater core. NOT a cheap fix. Nice to have heat again as we finally got a cold winter here.