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There should be a drain that allows the condensation to drain outside of the vehicle. Either the drain is clogged and causing the water to back up inside the plenum or your plenum has a crack in it and allowing the condensation to leak out the crack before it can be carried out of the drain. I suppose the drain line could be disconnected from the plenum also.
It isn'tleaking. The drain plug is closed off and it is draining inside the car.Check where the vent comes closest to teh floor and look for a drain tube going out the firewall.
Look for an evaporator drain that is clogged. You'll find it on the firewall possibly on the underside of the car. It will look like a hose that is coming out of the car and is connected to nothing. You can try sticking a coat hanger gently in the hose to try and dislodge whatever is blocking it, usually leaves.
You most likely have a plugged a/c evaporator drain tube. This tube drains away the water that condenses on the evaporator core [the one under the dash next to the heater core] whenever the a/c is running. If the tube is plugged then the water will fill up the bottom of the plastic heater/air conditioner housing until it overflows and leaks onto the floor. This drain is located on the engine side of the firewall, passenger side, down very low at the bottom curve of the firewall and is usually a very short rubber hose about 2" long. It can be hard to spot as there is often a lot of stuff in the way that makes it hard to see. A quick check is to park the car on a level spot and operate the a/c for sevreral minutes. You should soon see water dripping onto the ground from under the car on the passenger side of the vehicle. If you see it dripping then the hose is ok and you have a different issue, if not then you can pretty much bet that the hose is plugged. I usually use a puff of air to blow out whatever has plugged the hose [bugs, debris, etc] which fixes it until the next time it plugs.
IS THERE A WAY TO CHECK THAT.
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