Dry up the water. Take the car to a car wash and spray it good around doors and windows. If a leak is not visible then check the floor during rain storms while driving to see if water is coming in through a leak in the floor.
Pour a bucket of water into the passenger footwell
If water is getting into the passenger footwell one or more of the weatherstripping has failed. Check the doors as the weatherstripping makes a funned to drain a lot of the water. If there is a leak that can be leading into the cabin of the car.
There is pink anti freeze leaking inside of my car the passenger side what does this mean?
the heater core is leaking or ac drain is stopped up
If it is water, it could be a plugged up AC condensation drain or if it is engine coolant, it could be a leaky heater core.
I brought a ford fiesta 1.6 TDCI Zetic Sport in November 2006 since I had it I have experienced water sometimes 3inchs in passenger side footwell. The dealership have the car again at the moment stripping it down (again!) and can give me no answer neither can Ford. No one is interested in replacing the car and it currently stinks to high heaven. Hope you have more luck!
if your car has got air con and you had the pollen filter changed, check to make sure the cover was put back on properly
A/C drain line is stopped up. Crawl under the car and find the drain line. Usually located on the passenger side near the firewall. Use a blunt object such as a pencil to unclog.
it may be caused by the drain hole from the window screen being blocked it is located under the battery also check that the rain bar on top of the pollen filter is still there and not been left off allowing rain to travel in and down the heater pipes.
Rain
it is your water condenser for your AC. if you look up under the car on the same side in the same area you should see a tube that hangs down. it should be rubber this tube is clogged with something could be a bug or leaves. clean out the tube and the water will drain
Heateer Core is gone