What are the reasons for water leakage in the car cabin?

[DeTessa]

The car cabin may leak water due to the following reasons: 1. The windows were not closed during rainy days, and the driver did not confirm whether the windows were closed after getting off, causing rainwater to enter various parts of the car from the windows. Over time, water will drip under the car cabin; 2. Drainage issues. Excluding human factors, if water still drips under the cabin, the car's drainage system should be checked. The car has four drainage outlets, with the front two being the sunroof drainage outlets and the rear two being the car's flow drainage outlets; 3. Long-term accumulation of debris blocking the drainage outlets, especially for vehicles with sunroofs, as the opening of the sunroof makes it easier for debris to accumulate and cause leaks.