Sounds like either the windshield seal if defective or the heater core is leaking Check to see if water? is antifreeze
20-30 US Dollars
If the water pump is bad ussually the heater will stop giving hot air .
Passenger's side? Could be a leaking heater core
have your heater core checked its probually leaking
No It Can Not.
do a coolant pressure test.
more than likely the heater core is leaking
There is a drain on the outside firewall that is clogged.
AC condensation drain.
you could have a heater core leaking or your windshield is leaking and the water is running down behind the dash and onto the floor.
Shold be a weep hole underneath stem of water pump. If it's leaking water it needs to be replaced. You will be able to tell.
If that water is engine coolant, the heater core is leaking.