1. Faulty Door Seal: The rubber door seal around the door frame can deteriorate over time or become misaligned, allowing water to seep into the door from the outside. When the vehicle is driven in rain or encounters water splashes, the faulty seal can allow water to enter the door cavity.
2. Clogged Drain Holes: There are usually drain holes at the bottom of the door to allow water to drain out. If these drain holes become obstructed with dirt, debris, or leaves, water can accumulate inside the door and eventually seep into the interior of the vehicle.
3. Damaged Window Weatherstripping: Over time, the window weatherstripping can deteriorate and allow water to enter the door through the window area.
To resolve this issue, you should thoroughly inspect the door seals, weatherstripping, and drain holes for any damage or blockages. If necessary, replace the damaged seals or weatherstripping and ensure that the drain holes are clear. It's also recommended to apply a water-resistant treatment to the door seals to enhance their protection against water ingress. If you're unable to resolve the issue yourself, it's best to consult with a professional automotive technician.
