What Causes Water Leakage in the Car's Front Passenger Seat?

[JesseFitz]

Water leakage in the car's front passenger seat can be caused by the following reasons: 1. Clogged sunroof drainage holes: During rainy days, if the sunroof drainage holes are blocked, rainwater cannot drain out and may seep into the car interior. 2. Aging sunroof rubber seals: Plastic components can harden and deteriorate over time. Once the sunroof rubber seals age, their sealing performance decreases, leading to leaks during rain. 3. Clogged air conditioning drainage holes: If the condensation water produced by the evaporator cannot drain out, it may seep from the front passenger seat area. 4. Poor door sealing: Incorrect installation or aging/deformation of door seals can reduce the car's sealing performance, causing water ingress during rain. 5. Clogged door drainage holes: Due to their low position, door drainage holes are prone to clogging by mud. If rainwater inside the door cannot drain out, it may seep into the car interior.