What are the reasons for water entering the car cabin?

[MacAriel]

Water entering the car cabin can be caused by: 1. Clogged sunroof drainage holes: During rainy days, if the sunroof drainage holes are blocked, rainwater cannot drain out and may seep into the cabin; 2. Aging sunroof rubber seals: Plastic components can harden and deteriorate over time. Once the sunroof rubber seal ages, its sealing performance decreases, leading to leaks during rain; 3. Clogged air conditioning drainage holes: If the condensate water produced by the evaporator cannot drain, it may seep out from the position near the passenger seat; 4. Poor door sealing: Incorrect installation or aging and deformation of the door seals can reduce the car's sealing performance, causing water to enter the cabin during rain; 5. Clogged door drainage holes: Due to their low position, door drainage holes can easily get blocked by mud. If rainwater inside the door cannot drain, it may seep into the cabin.