What Causes Water Accumulation on the Car Floor?
2 Answers
Here are the reasons for water accumulation on the car floor: 1. Corrosion and perforation of the chassis: Water splashed by the wheels enters, carefully inspect and seal or install a liner. 2. The rain drainage holes under the front windshield are clogged with debris: Open the hood to check and clean them. 3. Damaged or ineffective door seals: Causes water to enter from the wind, inspect and replace them. 4. Clogged sunroof drainage tubes: Water enters from below the center pillar, inspect and clean them. 5. Poor sealing or corrosion and loosening of individual chassis screws: Causes water ingress, carefully inspect and seal or tighten them.
I've been driving for over 20 years and have seen too many cases of water accumulation on the floor. It's most likely due to clogged sunroof drainage holes, where leaves and sediment accumulate, causing rainwater to pour into the car during rain. Another common issue is the disconnection or blockage of the air conditioning drain pipe, which causes water to flow directly onto the passenger side floor when the AC is on. Aging door seals leaking water is also very common, especially in older cars where the rubber seals around the doors have cracked. During the rainy season, remember to regularly clean the sunroof drainage holes—just use an air gun to blow them out. If water accumulates after driving through water, check the chassis for rust penetration immediately, don't wait until the frame is completely rotted to regret it.
