Where does the water under the car mat come from?

[ClaireLee]

Here are the reasons for water accumulation under the car mat: 1. Spilled drinks or liquids that were not noticed during daily use. 2. Clogged drainage pipes inside the vehicle, preventing proper water flow and leading to accumulated water over time. 3. Leakage from the car's air conditioning system. Below are some common areas where water can enter the vehicle: 1. Drain holes: Doors have drain holes at the bottom; if water exceeds the height of these holes, it can enter. If the holes are blocked, water trapped inside the door cannot drain and may leak into the car. 2. Trunk: The bumper in the trunk has ventilation holes; if water exceeds these holes, it will inevitably enter the trunk.