Why is there water under the rear seat of the car?
2 Answers
The reasons for water under the rear seat of the car are: 1. Rainwater entering through the rear windshield: It is possible that the rear windshield was not properly closed, allowing rainwater to enter during rainy weather, resulting in water under the rear seat. Ensure the windows are properly closed to prevent water ingress. 2. Poor sealing of the rear doors: If the rubber seals are not installed correctly, repeated closing and squeezing of the doors can cause the seals on both sides to deform, leading to poor sealing of the car. In severe cases, this may even cause water to enter the car during rain. 3. Water ingress during car washing: During the car washing process, avoid using a high-pressure water jet directly on the seals. This not only easily causes the seals to deform under the pressure of the high-pressure water jet, allowing water to enter the car, but also greatly damages the seals.
I've loved fixing cars myself since I was a kid and have encountered many similar situations. Water under the rear seats is most commonly caused by a clogged or broken air conditioning drain pipe, which prevents condensation water from draining properly and causes it to seep into the car floor. Especially in summer when the AC is used frequently, the pipe can easily get clogged, and water slowly accumulates under the rear seats. Additionally, if the door seals are worn out or the door itself has cracks, water can leak in from the edges during rain or car washes. For cars with sunroofs, clogged drainage holes are also a common issue. I once helped a friend fix this problem and found that accumulated water can lead to rust on the car body and a stubborn moldy smell that's hard to eliminate. I recommend car owners regularly check the AC drain outlet and clean it with a small stick; inspect the door seals and apply some lubricant if they're loose to protect them. Don’t ignore it—severe rust damage can be much more expensive to repair later.
