Why is there water under the car's front passenger seat?
2 Answers
The reasons for water under the front passenger seat are as follows: 1. Clogged sunroof drainage holes: Sunroof drainage holes are prone to being blocked by fallen leaves and dust. Once clogged, rainwater cannot drain properly during rainfall and may seep into the car interior. 2. Aging sunroof rubber seals: Rubber components harden and deteriorate over time. When the sunroof rubber seals age, their sealing effectiveness decreases, leading to leaks during rainy weather. Additionally, using high-pressure washers or strong acidic/alkaline cleaners during sunroof maintenance can cause deformation and premature aging of the rubber seals.
I've been helping with car repairs for several years and often encounter the issue of water accumulation under the front passenger seat. The most common cause is condensation water produced by the air conditioning system. If the drainage pipe is aged and cracked, clogged by leaves or dirt, or improperly installed, water leaks onto the passenger floor. Another frequent issue is clogged sunroof drains, allowing rainwater to flow in through the channels. In older cars, damaged door or window seals can let rainwater seep in and accumulate. Occasionally, coolant leaks can also cause this, which has a sweet smell. I recommend paying attention to whether the air conditioning is dripping while driving and checking the carpet for moisture after rain. Regularly cleaning the drainage pipes and seals can prevent this issue; otherwise, accumulated water can corrode the floorboard and short-circuit the wiring, leading to bigger problems.