Why is water leaking into the front passenger door of a Nissan Tiida?

[VonAlice]

Nissan Tiida front passenger door water leakage causes are as follows: Sunroof drain hole clogged: During rainy days, if the sunroof drain hole is clogged, rainwater cannot drain out and will seep into the car interior; Sunroof rubber seal aging: Plastic components harden with age during use. Once the sunroof rubber seal ages, its sealing performance decreases, leading to water leakage during rain; Air conditioner drain hole clogged: If the air conditioner drain hole is clogged, condensation water from the evaporator cannot drain out and will seep out from the front passenger side; Poor door sealing: Incorrect installation or aging/deformation of door seals reduces the car's sealing performance, causing water ingress during rain.