Why Is There a Lot of Water Under the Car Floor Mat?
2 Answers
There may be a lot of water under the car floor mat due to clogged sunroof drainage pipes, non-waterproof floor mats, or damaged door drainage pipes. Clogged sunroof drainage pipes: Check if the sunroof drainage pipes are clogged. Fully open the sunroof, and you will see a groove. Slowly pour water into the groove (the sunroof drainage pipe) to see if the water drains out. If water leaks into the driver's compartment, it is mostly from external sources, while leaks into the passenger compartment are often due to air conditioning water. It is recommended to have it inspected at a repair shop. Non-waterproof floor mats: A lot of water under the car floor mat could also be caused by non-waterproof floor mats. It is advisable to use floor mats with waterproof properties. Non-waterproof mats are prone to mold and odor, affecting their lifespan. Damaged door drainage pipes: Inspect the door drainage pipes. Open the door, and you will find small holes at the bottom—these are the drainage holes. Check if they are clogged.
I found that water accumulation under car floor mats is quite common, mainly caused by clogged door drain holes or aging sunroof seals. Rainwater or car wash water can seep through gaps and accumulate under the mats. I remember seeing water stains after driving during last year's rainy season, so I checked the car manual and found that many models have narrow door drain holes that are prone to clogging. If not addressed promptly, the moisture can corrode the metal underbody, leading to rust, and may also cause mold growth and unpleasant odors, posing health risks. It's recommended to regularly flush the door drain holes and sunroof areas with a hose to keep them clean. Using waterproof floor mats can also help avoid this issue, but fundamentally, it's essential to maintain the vehicle's sealing components properly.
