What Causes Water in the Jetta Trunk?
3 Answers
Jetta trunk water causes are detailed as follows: Damaged Sealing Strip: The waterproofing of various parts of the car body is ensured by sealing strips. These rubber strips have a certain degree of strength and hardness, and do not deform under certain pressure conditions. However, prolonged exposure to external air can cause natural aging of the rubber, and high frequency of use can lead to wear and tear. Once the sealing strip is damaged, water can easily seep in. Trunk Deformation: The design of the car trunk follows specific rules, with corresponding drainage curvature designs in the A, B, C, and D zones. If the trunk's shape is compromised, severe water leakage can occur during rain.
Last week, my Jetta's trunk was leaking water, which was really annoying! I checked and found that the common causes are aging or cracking of the sealing strips around the trunk lid, allowing rainwater to seep in, especially noticeable during heavy rain. Also, the drainage holes at the bottom of the rear windshield can get clogged with leaves and dirt, causing water to backflow into the trunk. Don’t forget the holes around the trunk light—if they’re not installed tightly or the sealant fails, water can leak in there too. Additionally, if the rear bumper has a design flaw, water from car washes can flow back. I quickly cleaned the drainage holes and sealing strips, and the problem was gone. It’s recommended to regularly check these areas to prevent water damage to items like spare tires or tools, as it can really affect your driving mood.
In the workshop, there have been quite a few cases of water accumulation in the Jetta's trunk, mainly attributed to several points. A damaged trunk seal is a common culprit, as the rubber deteriorates and leaks over time. Clogged rear wiper drainage tubes can cause water to flow into internal water collection areas. Unsealed wiring harness holes, especially when the trunk light has been modified, are often overlooked. Checking for wet spots on the inner lining can help locate the leak. If water accumulation is not addressed promptly, the car's underbody can rust and develop a musty odor. I recommend using high-pressure air to clear the drainage tubes and repairing or replacing the rubber seals to avoid the time-consuming process of major repairs.
