Where is the water in the trunk coming from?

[LeIsabelle]

Reasons and solutions for water in the trunk are as follows: Possible causes of water ingress: Check for aging or damage to the trunk seal. Look for cracks at the tail light housing weld points. Inspect if the sunroof drain tube has detached. Examine any damage to the paint sealant at the roof connection points, etc. Solutions: First, drain the water. There is a rubber drain plug at the bottom of the spare tire well in the trunk - remove it to drain water. Locate the leak source. Check if the trunk lid is deformed or if the surrounding seals have aged. Use a hose to spray water and observe where water drips in, or close the trunk after water enters to see where light shines through, then mark those spots. Purchase a bottle of silicone sealant, open the trunk, remove interior trim panels, and apply sealant to marked areas (preferably from the outside). The rear bumper must also be removed for proper sealing. Replace aged seals at an auto repair shop. Additionally, if the vehicle is still under warranty, contact the dealership or arrange for authorized service center repairs.

[DiAva]

I had the same issue with my old car. After struggling for a while, I found out it was due to the deteriorated sealing ring of the rear tail light. When washing the car, water seeped in through the gaps around the light frame, accumulating in the spare tire well. The problem was solved by replacing it with a 20-yuan rubber ring. Actually, there are five common places for trunk leaks: deformed tailgate seals, clogged rear drainage holes, cracked rear windshield adhesive, detached body weld seams, and water ingress through roof rack screw holes. If you find water under the spare tire, remember to check the plastic drain plug—sometimes car wash attendants forget to put it back.

[EverlyLynn]

Last time I helped my cousin fix his leaking trunk, I found out it was caused by improper handling of the wiring hole when installing the rearview camera. There was a thumb-sized rubber grommet that the modification shop punctured and just wrapped haphazardly with electrical tape. During heavy rain, water seeped right in. I recommend focusing on checking three key areas: whether the rubber sleeve for the tailgate wiring harness is cracked, if the vent cover on the inner side of the rear fender has fallen off, and whether the clips on the rear bumper are broken and letting water in. If you're handling it yourself, you can buy a tube of automotive sealant and apply it along the gaps—it costs less than 30 yuan.

[StTyler]

Last rainy season, my SUV's trunk kept accumulating water, and it turned out the shark fin antenna base on the roof was loose. Water ran down the headliner into the D-pillar trim, eventually leaking into the trunk's inner layer. These hidden leaks are the most troublesome, requiring interior trim removal to locate. Another common cause is cracked rear window sealing strips, especially when high-pressure car wash spray forces water in. The simplest detection method: Have someone shine a flashlight inside the trunk while you spray water outside with the trunk closed - wherever light leaks out indicates the water entry point.

[SanChase]

Having repaired cars for ten years, the most common cases of trunk water leakage I've seen are in accident vehicles. Poorly done rear panel sheet metal work can cause water to backflow from the taillight mounting positions during rain. Once, a customer had a 'fish tank' in their trunk, and upon disassembly, we found the repair shop had missed three sealing rivets after a rear-end collision. Also, a reminder to power tailgate owners: aging rubber grommets on hydraulic strut wire passages can also cause water intrusion. Leakage from this area usually drips onto the lock mechanism. For a temporary DIY fix, use painter's tape to seal all tailgate gaps, then perform a water spray test for more accurate diagnosis.

[LaParker]

After my colleague's car got flooded, the trunk was always damp. It turned out the spare tire well drain plug was missing. Normally, these drain plugs have a one-way valve design - without it, muddy water can splash back in on bumpy roads. Another easily overlooked issue: some cars have poorly designed rear water channels. When leaves block the drainage holes, water can flow backwards into the trunk through the fuel filler cap area. Recommendation: Clean the drainage channels below the rear windshield monthly. Pour a bottle of water over the rear window to check if it drains properly underneath the vehicle.