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I have a beater Cavalier (91) I bought that my son will be driving. When it rains hard the pass side floorboard carpet gets soaked, as does the carpet leading up to the heating/cooling ducts. I removed the wipers, cowl and airbox, and cleaned a bunch of mud from the lowest point in the airbox and siliconed some suspect seams. Well after yesterdays deluge I looked this morning and the carpet is soaked again. I'm thinking about taking a hose and having someone sit in the car to see if we can find the leak. Anyone have experience with this? Any Ideas?
Thanks in advance.

Yes sir there is a tube under the dash that is stopped up. I don't know right where on that car but it comes in around the heater box. Look under there and clean it out when yu find it. It's a drain tube for condensation in the heater box. I use a coat hanger that I straighten out to run thru them.

Could it be the door weatherstrip?