Why Does the Car Trunk Leak When It Rains?
3 Answers
When using the sunroof and trunk in daily life, it is essential to master the correct usage methods and perform regular maintenance. If any abnormalities are found, timely inspection and repair are necessary. There are generally two main reasons for water leakage in the car trunk during rain: 1. Aging of the sealing rubber strip; 2. Blockage of the drainage pipe. Additional Information: The car trunk usually contains the spare tire, vehicle first aid kit, onboard tool kit, warning triangle, fire extinguisher, car refrigerator, emergency fuel tank cap release cable, and in some high-end models, the starting battery is also located in the trunk. The trunk also helps to release and mitigate collision pressure.
I remember water leaking into the trunk on rainy days, most likely due to aging or cracked trunk seals, allowing rainwater to seep through the gaps. Additionally, clogged drainage holes are quite common, especially when parked under trees where accumulated leaves and sediment prevent proper water drainage, causing backflow. Damaged sealing strips near the taillights can also be problematic—a friend's car leaked there because they didn’t pay attention during car washing. Loose body weld points or improperly installed parts after repairs can also lead to leaks. I once experienced this with an old car—during heavy rain, the trunk got soaked, and dealing with it was a hassle. Regularly checking if the seals remain soft and crack-free, and keeping drainage holes clean and unclogged can prevent most issues. Placing some moisture absorbers in the car can also help prevent mold, as excessive humidity is bad for electrical wiring.
Water leakage in the trunk is primarily caused by issues with the sealing and drainage systems. When the sealing strips deform and harden, they lose elasticity, allowing rainwater to seep in through edge gaps. Drainage holes, typically located at the lower part of the vehicle body, often get clogged with debris, preventing proper drainage during heavy rainfall. Poor sealing around rear light assemblies or antenna bases can also lead to leaks. During repairs, I've found that inadequate welding points on the vehicle body may contribute to water seepage. After rain, promptly open the trunk to check for water accumulation and use a vacuum to remove water to prevent corrosion. If leakage occurs shortly after the warranty period expires on a new car, it might indicate a manufacturing defect, and the manufacturer should be contacted. For daily maintenance, parking in open areas reduces the chance of water accumulation, benefiting vehicle upkeep. Regularly clean drainage holes with a soft brush, ideally checking them weekly.
