Why is my driver side floor wet when car is parked

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! If your 2003 Lexus ES300 is turning into a mobile kiddie pool overnight, it's probably due to a clogged sunroof drain or a leak around the windshield seal. When these drains get blocked, water finds its way into the cabin, especially after rain or heavy humidity. It could also be the A/C evaporator drain hose—if it's clogged, condensation will back up and spill onto the floor. The fact that it’s worse when parked suggests it’s not something from the engine but more likely from environmental moisture. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!