firstly, the door sealing strip is not tightly sealed, resulting in water leakage of the door;

second, the water outlet under the car door is blocked, which prevents the water from flowing out;

thirdly, the waterproof membrane inside the car door is broken, causing water to flow directly to the doorsill bead and then to the foot pad.

2. In view of the problem that the door sealing strip is not tightly sealed, check whether your sealing strip is seriously damaged or deformed. If so, replace it with a new one. If you can't find anything wrong, adjust the door inward, so that the door sealing strip will be in closer contact with the door, and water will not easily leak in!

3. In order to solve the problem that the water outlet of the car door is blocked, we gently pull open the strip under the car door, and we will see a square water outlet. If your car is not cleaned for a long time, it should accumulate some silt and debris. Use a screwdriver to clean up all the blocked debris, so that the water can be discharged!

4. To solve the problem that the waterproof film inside the car door is broken, it is complicated. Sprinkle some water on the glass first, and then open the car door to see if there is any water leakage.

5. Take out the t-2 spline and the t-3 spline, and use a screwdriver to remove the door trim panel of the leaking door, and then you will see a layer of plastic film inside. This waterproof film is stuck to the door panel with sealant. Due to dust, the sealant is opened and the waterproof film can't stick, so the water will flow to the door sill through the gap, accumulate more and more, and finally flow to the car. Therefore, in this case, it will be replaced with a waterproof film.