1. Clogged A/C Drain Tube: The A/C drain tube is responsible for draining condensation from the air conditioning system. If this tube becomes clogged, water can back up and leak onto the passenger side floor. To fix this, you will need to clear the clog from the drain tube.
2. Damaged Weather Stripping: The weather stripping around your car's doors and windows helps to keep water from entering the interior. If the weather stripping is damaged or worn out, water can leak through and onto the floor. To fix this, you will need to replace the damaged weather stripping.
3. Sunroof Drain Tube: If your car has a sunroof, there is a drain tube that allows water to drain away from the sunroof. If this drain tube becomes clogged, water can back up and leak into the car through the passenger side window. To fix this, you will need to clear the clog from the drain tube.
4. Clogged Cowl: The cowl is the area at the base of the windshield. It channels water away from the windshield and onto the ground. If the cowl becomes clogged with leaves or debris, water can back up and leak into the car through the passenger side floor. To fix this, you will need to clear the clog from the cowl.
5. Body Seam Sealant: The body seam sealant is used to seal the gaps between the body panels of your car. If the sealant is cracked or damaged, water can leak into the car through these gaps. To fix this, you will need to repair the damaged sealant.
It's important to note that diagnosing and fixing water leaks can be complex, so if you're not comfortable doing it yourself, it's best to take your car to a qualified mechanic. They can properly identify the source of the leak and make the necessary repairs.