How does water enter the car when the sunroof drain is blocked?

[LoganLynn]

Sunroof leakage issues are mostly caused by blockage or detachment of the sunroof drainage pipes. Here are the detailed explanations: 1. Gap between the sunroof and the car body: When it rains, some water enters the sunroof frame through the gap between the sunroof and the roof. The sunroof frame is designed with drainage channels that guide the water to drainage pipes at the four corners of the frame, which then discharge the water outside the car. 2. Leak prevention check: Before the rainy season, it's advisable to check if the sunroof drainage pipes are functioning properly. Owners can open the sunroof, pour water from a water bottle onto the two front corners of the sunroof, and observe if the water flows down smoothly. Also, check if an approximately equal amount of water exits under the car. The two rear corners are harder to reach and may not need testing, as most car sunroofs are designed with a front-low, rear-high slope, meaning most water drains through the front drainage pipes.