Why is there water leaking from the top of the car door?
2 Answers
The reasons for water leaking from the top of the car door: The door seal is not tight enough, causing water leakage; The drainage outlet at the bottom of the door is blocked, preventing water from draining out; The waterproof membrane inside the door is damaged, allowing water to flow directly onto the door sill trim and then onto the floor mat. Below are detailed solutions: Door seal not tight enough: If the seal is severely damaged or deformed, it needs to be replaced with a new one. If the exact location of the damage cannot be identified, adjust the door inward slightly to ensure a tighter contact between the door seal and the door, making it harder for water to leak in. Blocked drainage outlet at the bottom of the door: Open the silicone strip at the bottom of the door to reveal a square drainage outlet. If the car hasn't been cleaned for a long time, mud and debris may accumulate. Use a flat-head screwdriver to clear the blocked debris, allowing water to drain out and solving the leakage issue. Damaged waterproof membrane inside the door: First, sprinkle some water on the window, then open the door to check for any signs of leakage. Remove the T-20 spline, T-30 spline, and flat-head screwdriver to dismantle the door trim panel of the leaking door. Inside, you will see a plastic membrane. This waterproof membrane is glued to the door panel with sealant. Dust can cause the sealant to lose its adhesive strength, allowing water to seep through the gaps onto the door sill and eventually into the car. If this is the case, the waterproof membrane needs to be replaced.
Last year during the rainy season, I noticed rainwater leaking from the top of the car door, dripping down the door frame gap onto my legs and the seat, which was particularly annoying. I consulted a friend at a repair shop, who said it might be due to aging and hardening of the door seal or improper door installation. Over time, the seal can dry out, crack, and lose elasticity. Sometimes, the door drainage holes get clogged with mud or leaves, causing water to backflow. Damage or deformation to the door's outer panel from collisions can also cause this issue. After checking myself, I found that the seal was indeed cracked. It's recommended to avoid parking in direct sunlight or high heat regularly and keep the doors clean. Water leakage can easily lead to interior mold, damaging the upholstery and electrical circuits. It's best to visit a professional shop for replacement or repair as soon as possible to minimize unnecessary damage.
