1, the window was not closed in rainy days. I don't know if I closed the window after getting off the bus, which caused the rain to float to all parts of the car from the open window. In the long run, water will drip under the cab of the car.
2. There is something wrong with the drainage pipe. If there is still dripping water under the cab of the car after eliminating human factors, the drainage hole of the car should be checked. First of all, there are four water outlets in the car. The first two outlets are used to drain the water from the skylight, and the last two outlets are used to drain the water flowing in the car.
3. Long-term accumulation of garbage will block the water outlet. Especially for vehicles with skylights, it is easier to accumulate garbage and cause water leakage after opening the skylights.