Maybe a bad heater core
heater core leaking
Water on the passenger side floor would be a plugged up AC drain. The drain is located under the hood, at the lowest point on the HVAC box on the firewall. However if the floor is wet with engine coolant, the heater core is leaking.
It could be the heater core leaking.
The ac drain is plugged. The drain hose is on the firewall on the lower passenger side. ...that, or your heater core is leaking.
I had a 1996 es300 and was allways getting water on my passenger floor. The problem was some type of condensation from the air conditioner. i do not know if this information will help you but i figured i would share it with you.
the heater core has got a hole in it or your top has a hole init. If the water is green it is your heater core. if not it is your top.
Check the AC evaporator drain line...is it not connected to the outside
If it's the front passenger side ,I would say your heater core is leaking .
My 95 blazer has a leak that normally shows up after a heavy rain. It is caused by water running down the windshield into the air duct outside the vehicle. The water runs down the passenger side of the duct where the fresh air vent is located. If the fresh air vent is stuck open and a heavy rain comes, I'm given a puddle of water in the passenger side floor mat.
My guess is that you have a hole in your floor pan on that side all it takes is a little hole and a lot of rain and your flooded, try looking for the hole it should be visible..
sounds like there could be a plug knocked out of the firewall on the passengers side which would allow water to enter when you hit some puddles and splashed up
water in passenger floorboard, where is the hose that would cause this?