Why is the car sunroof leaking into the cabin?

[McMaximus]

The reasons for water leakage from the car sunroof into the cabin are: blockage of the sunroof drainage pipe or poor sealing of the sunroof rubber gasket. It is recommended to check if the car sunroof has this issue. Additionally, the drainage pipe is divided into two sections. If the sunroof leaks into the cabin, it might be due to blockage causing water to seep into the cabin from the joint between the two sections. Other reasons for water leakage from the car sunroof into the cabin: 1. Rain entering through an unclosed window during rainy days. If the driver does not confirm whether the windows are tightly closed after exiting the vehicle, rainwater may drift into various parts of the car through the loosely closed windows. Over time, water will drip under the car's cabin. 2. Issues with the drainage outlets. After ruling out human factors, if water still drips under the car's cabin, the vehicle's drainage outlets should be checked. The car has four drainage outlets: the front two are for sunroof drainage, and the rear two are for draining water flowing on the car. 3. Long-term accumulation of debris blocking the drainage outlets, especially in vehicles with sunroofs, as opening the sunroof makes it easier for debris to accumulate and cause leaks.