Water leaking onto passenger side floorboard,soaking the carpet

Check the door drain vents in the bottom of the door ensure they are not blocked, when it rains the rain travels through the door at the window seal and escapes through opening,
. Open the door and check underneath. If blocked water fills the door and gets into the car. Also if the car has a sunroof water may be coming through there. If not this try going through a car wash while in the car and seen if you can see it hear any water getting in my

it is leaking from the outside air intake there is a hold there to clean it on on the passenger side top grill by windshield ask me more will explain

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.

Blocked A/C drain or leaking heater core. Are you going through coolant?

a couple things to look at if it has a sunroof the sun roof would have drain hoses that run down in each corner next you need to look at the cowl this is the section in front of the windshield that has a drain on it as well if you find nothing there the next step would be to remove the seats and carpet and sit in the car while running water over it either way you should remove the carpet and make sure it is dry all the way threw or mold will start to grow and you will never get ride of it not good for your heath other key spots to look at is if the windshield was ever replaced it could be a poor seal

There should be a drain hose to drain the water to under the car. Sounds like the hose has debris in it.

is it only when the ac is on? there is a pan under the ac unit that has a hole in it to allow the condensation to empty. if that hole gets plugged it could cause the condensation to build up and back into the inside of that car. i unplugged mine and floor stayed dry

You could have a leaking windshield seal, and its running down the inside of the dash and onto the mat. Has the windshield been replaced?

Not a Heating Modual What you have in a Leaking Heater CORE, I Very Dificult part to remove -------------------------------------------------------------------------------------------------------------------------------------------------
Unless the windshield has a leak but from your discription probably not. I hope this helps you AND
PLEASE RATE My ANSWER

Here is what all dealers do to find water leaks, we spray a fine mist of water on the car near where the water might be comming in with a spray nozzle, someone gets inside the car and look for the leak, there is no other way, and I have been doing this 30 years.