What Causes Water Leakage Under the Driver's Seat?
2 Answers
Here are the possible reasons for water leakage under the driver's seat: 1. Unclosed windows during rain: Failing to ensure windows are properly closed after parking may allow rainwater to seep into various parts of the vehicle. Over time, this can lead to water dripping under the driver's compartment. 2. Drainage outlet issues: If water leakage persists after ruling out human factors, the vehicle's drainage outlets should be inspected. There are four drainage outlets in total - the front two are for sunroof drainage, while the rear two are designed to drain flowing water from the vehicle body.
Water leakage under the driver's seat—I encountered this issue a few years ago, and it drove me crazy back then. It happened during summer when I was using the AC, and the seat cushion was always damp. After a lot of troubleshooting, I found out the AC drain pipe was clogged. Normally, AC condensation should drain out from under the car, but when blocked by leaves or debris, the water flows back into the cabin. I tried clearing it myself with a wire, but it didn’t work well, so I ended up going to a repair shop. My experience taught me to regularly check the humidity under the floor mats, especially in hot weather. If you notice a musty smell or mold, it might be due to water leakage, and delaying repairs can corrode the floor and compromise safety. Another common cause is aging door seals, which allow rainwater to seep in—replacing them isn’t expensive. I suggest checking the AC issue first before the water damages the electrical system, which would be a much bigger headache.
