Water coming from somewhere on passenger side floor

Is it water or is it radiator fluid. Radiator fluid will have a sweet smell. If it is water it is probably because the windshield isn't sealed properly and is leaking. If it is radiator fluid then you have a cracked heater core. You can see the result of this by turning on the front defrost and instead of clearing the windsheild it will fog it up. Try pulling the carpet back on the passenger side and put a light dusting of flour on the floor. This should help you locate where the leak is coming from.

Could be the drain for the ac is plugged up. Usually when this happens the passenger side floor gets wet, but it could be coming out on the driver's side when you take a right turn.
The drain should be on the bottom of the firewall near the floor, you should see water dripping onto the ground when the ac is on.

sounds like you have a bad heater core

If it's green or has a sweet smell, it's anti-freeze. This is a heater hose connection or most likely the heater core itself. Check your fluid level, if it's low you have a leak. If these aren't the problem, then you have a seal leak (body) somewhere.

When your not feeling heat coming from the heater it usually means that the coolant level is too low in the radiator. It sounds like you have a coolant leak somewhere which is causing your overheating problem. Fill your radiator and let the engine run for about a half hour with the radiator cap on tight. Then turn off the engine and check for any leaks under the van. If you don't see any leaks under the van then see if the carpeting is wet on the passenger side of the vehicle. If the carpet is wet and it smells like anti-freeze you have a heater core that is leaking. I hope this helps you. :)

there is a leak because the foam has disintegrated, or the seal has broken open down by where the feet of the passenger is. Rust stains tell me that the leak may be caused by a break in the body somewhere.

Try spraying expanding foam in the area between the plastic and the metal parts to try to seal out moisture from coming into the passenger compartment.

Sounds like the heater core is leaking. Fill up the coolant and look under the carpet on the passenger side and see if there is not coolant there. IF it is a really minor leak you may be able to use a radiator fix, but do not buy something cheap and follow the directions. If one application does not seal it up, replace the heater core. It is not worth overheating the motor to try more of the sealer; it can clog the coolant passageways in the motor.

Hope this helps

the water sound i believe is from being low in antifreeze..if you are adding water oncce a week then there is a leak.. try looking on the inside of the car on the passenger side carpet to see if its wet..if not, then check things under the hood such as, heater hoses for heater core, water pump, thermostat housing, radiator, core plugs, block heater..if the smell is coming from the inside and there is a film on the window, then chances are you need a heater core....try that.

I think that I can help you. It sounds like your drain-tube is plugged up. Get in the passenger side, and pull the carpet back from under the glove box. Look for a black rubber pipe that goes from a black box, and pokes thru the firewall, on the passenger side. Remove the hose from the box, and have a container ready to catch water. If water comes out of the black box, your drain hose is plugged up. Clean out the clog, and you will be golden.

sounds like the air conditioning drain for condensation is plugged