Why is the passenger side of your car floor soaked when it rains but there are no wet spots on the roof or windows?

Answer 1

Answer

Simple, you have a leak. Suspect that it is leaking from the cowl. Check the drain for the condenser and see if it is plugged. Check for debris below the window in the channel.

if you have a sunroof, sometimes the drain hose gets clogged and water will back up into the car. It can run down the inside of your A pillar and end up in the floor board. Similarly, if it happens when you run the A/C, the condensation drain hose could be clogged and backing up into the floor.

Answer 2

You didn't mention what vehicle you have but in most vehicles the heater core is located under the dash on the passenger side. The heater core is known to spring a leak and show up on the passengers floor. Turn on the defroster and see if your nose senses the sweet smell of radiator coolant. The inside of the windshield my fog up when the defroster is turned on, this would also indicate a leaky heater core.