Why is there water leakage in the car?
3 Answers
The reasons for water leakage in the car are: 1. Clogged sunroof drainage holes: During rainy days, if the sunroof drainage holes are blocked, rainwater cannot drain out and will seep into the car; 2. Aging sunroof rubber seals: Plastic components harden and age over time, and once the sunroof rubber seals age, their sealing performance decreases, leading to water leakage during rain; 3. Clogged air conditioning drainage holes: Condensation water produced by the evaporator cannot drain out and will seep out from the position near the co-pilot seat; 4. Poor door sealing: Incorrect installation or aging and deformation of door seals can reduce the car's sealing performance, causing water to enter the car during rain; 5. Clogged door drainage holes: Due to their low position, door drainage holes are easily blocked by mud, preventing rainwater inside the door from draining out and causing it to seep into the car.
Last time my car leaked water, mainly because the sunroof drain pipe was clogged with leaves, and the water couldn't drain out, so it poured back into the car. After the rain, the back seat was soaked. The door seals can also leak when they age, especially in older cars where the seals crack over time, allowing water to seep in through the door gaps. If the windshield seal is poorly installed or corroded, rainwater can seep under the dashboard. A clogged condensate drain pipe in the air conditioning system can cause water to flow back into the cabin, which is common when using the AC in summer. Clearing debris around the sunroof and regularly checking door seals can prevent most of these issues. Otherwise, water accumulation inside the car can lead to mold, damage to carpets and electronics, and expensive repairs. I recommend paying attention to these points before the rainy season.
If water suddenly leaks into the car, a systematic inspection is needed to identify the problem. The sunroof drain holes are often clogged with debris, causing water to overflow into the cabin when it accumulates. If the drainage holes at the bottom of the doors are blocked with mud, water may leak in along the door frame when opening. Rainwater can seep through gaps if the windshield seal fails, which may result from improper installation or aging. A blocked air conditioning condensate drain pipe can cause moisture buildup and backflow. A damaged trunk seal can allow water to seep into the rear seats. It's recommended to first use a hose to simulate rainfall and observe the water flow path for easier problem identification. Ignoring leaks may lead to chassis corrosion and electrical hazards, so visiting a repair shop early can save both trouble and money.
