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The vent under the hood on passenger side , more than likley the seal is leaking letting the water go inside. I have had to fix my mother's 1999 and my 2001 lincoln. It is not very hard to fix. You will have to remove the screws on the passenger panel under the hood to get to the vent. Pry the vent loose and re seal. You can take the hose and spray water on the W/S when it is dry to make sure it is coming in at that location.
If it's leaking that bad, open the hood take off radiator cap and fill with water (without making a mess and spilling a bunch. Then simply watch for where the leak is at, if it's leaking from a hose, the radiator, or from around the area where the belt is located on the passenger side of the engine compartment. If it's leaking from the passenger side around the belt area your water pump is the most common cause. They are made so when the bearing wears out around the shaft the pulley bolts, it has what are called weep holes and the water just runs out to tell you to replace the water pump.
It sounds like the leak could be under the passenger side dashboard which is where the heater core is located. The heater core a small radiator that a fan blows air over to heat the inside of your car. Is the steam coming out of the vents when you turn the heat on?