What Causes Water Leakage Under the Driver's Seat?
2 Answers
Water dripping under the car cabin is mainly caused by the following reasons: 1. Unclosed windows during rainy days: After getting off the car, if you fail to ensure that the windows are tightly closed, rainwater may enter various parts of the car through the unsealed windows. Over time, this can lead to water dripping under the driver's cabin. 2. Drainage outlet issues: After ruling out human factors, if water continues to drip under the car cabin, 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 water flowing on the car.
I once encountered this issue where my feet got wet while driving, which really startled me. The main culprit was the air conditioning system. Using the AC frequently in summer can cause the drain pipe under the car to clog, leading to water backing up into the cabin. Another possibility is aging door seals, allowing rainwater or car wash water to seep in. Additionally, if the heater core pipes crack, coolant can leak inside. This problem isn’t just annoying—over time, the carpet can mold and breed bacteria, which is harmful to health. I recommend first checking the AC drain pipe near the car’s underbody for any blockages and gently clearing it. If that doesn’t help, inspect the door seals and interior next.