1. Clogged sunroof drains: If the sunroof drains are clogged, water can back up and leak into the passenger compartment. Check the drains and clear any obstructions.
2. Leaky windshield: A leak around the windshield can also allow water to enter the passenger compartment. Check the seal around the windshield and repair any leaks.
3. Damaged weatherstripping: Damaged or missing weatherstripping around the doors or windows can allow water to enter the passenger compartment. Inspect the weatherstripping and replace any damaged or missing parts.
4. Leaking heater core: A leak in the heater core can also cause water to accumulate in the floorboard. Check the heater core for leaks and repair or replace it as necessary.
5. Condensation: Condensation can also cause water to accumulate in the floorboard, especially in humid climates. Try to reduce the amount of moisture in the car by using a dehumidifier or keeping the windows open when the car is not in use.
If you are unable to find and fix the source of the water leak, you should take your car to a mechanic for diagnosis and repair.
