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There is a tube on either side, and they have a tendancy to get clogged with debris. I would attempt to clean them out. You may also want to remove the wipers, and tale off the top of the wiper module. Leaves, and other debris tends to collect under there, and that's what clogs the drain tubes. Good luck, and let me know how it works out. Thanks.
you live in a high humidity area. are all the seals on your doors good? is it loosing coolant? could also be a bad heater core. and water on the floor boards? not loosing coolant and water on the floor boards? could be a plugged drain on your a/c. hope this gives you a place to start looking
is it only when the ac is on? there is a pan under the ac unit that has a hole in it to allow the condensation to empty. if that hole gets plugged it could cause the condensation to build up and back into the inside of that car. i unplugged mine and floor stayed dry
Check the weatherstripping around the door. Also look under the dash board for signs of water leaking from the firewall. If your weatherstripping isn't damaged anywhere then make sure the liquid doesn't smell like antifreeze. If it does then you've busted the heater coil. Do not drive the car if this is the case. Your coolant will all leak into the car and it will overheat. Replacing a heater coil tend to be a huge pain in the **** and if you can pay someone else to do it by all means do. The heater coil can be bypassed by connecting the water inlet hose to the outlet hose where they go into the firewall. This is a crutch but your car will run fine until you can get the heater coil replaced. A mechanic will do the bypass for you pretty cheaply. It only takes 5 minutes.
The drain tubes are a definate possibility, but, usually you will see a water mark on the headliner. The panels are fairly easy to remove, if it has assist handles you will need to remove the rubber or plastic plugs that cover the screws, then remove the screw and gently pull out and upward on the panel, it has metal clips that snap into the sheet metal but it also will have a plastic hook to locate the bottom of the panel, you don't want to break this. This will allow you to check the drain tubes. Also don't rule out the windsheild itself. Especailly if it has ever been replaced. Sometimes there is an air bubble in the sealer/adhesive tube they use to secure the windsheild, if not caught and filled in it will cause a water and or air leak (this happens from the factory too).
There is anther fuse box inside the vehicle.I'm just not positive exactly where,but there is one inside.Look around under dash on driver side with a flashlight,get on the floor board and look up.General Motors sometimes puts them at the end of the dash on drivers side.I have seen some located behind a cover,on the driver side lower dash.Just have to look.It's there.