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

1 Answers
SanAbel
07/30/25 10:19am
Water leakage under the car's front passenger seat can be caused by clogged door drainage holes, door leaks, or aging of the sunroof's rubber seal. The details are as follows: Clogged door drainage holes: Due to the low position of the door drainage holes, they are prone to clogging by mud. If rainwater accumulates in the door and cannot drain, it may seep into the cabin. Check if the door drainage holes are clogged. If they are, clean them thoroughly and drain the accumulated water. Door leaks: Replacing the window regulator can cause the door's waterproof membrane to lose its tight seal, as the membrane must be peeled off during the replacement process. If the waterproof membrane is not sealed properly, heavy rain can lead to water entering the cabin. A secondary sealing process or replacement of the waterproof membrane may be necessary. Aging of the sunroof's rubber seal: Rubber components harden and age over time. When the sunroof's rubber seal ages, its sealing performance deteriorates, leading to leaks during rain. Additionally, using high-pressure water jets or strong acidic/alkaline cleaners during sunroof maintenance can deform or accelerate the aging of the rubber seal.
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