Why is there water under the car cabin floor mat?

[Valentina]

Water under the car cabin floor mat may be caused by leakage from a certain part of the vehicle body. It is necessary to locate the leaking area and repair it, and also clean the water under the floor mat. Many parts of the vehicle body have water drainage channels or drain holes, such as doors, windshield, sunroof, trunk lid, etc. If the drain holes are blocked, rainwater may enter the cabin during heavy rain, which could damage the electronic equipment in the car. It is recommended that owners regularly clean the drain holes and water drainage channels during maintenance. There are drain holes at the bottom of the doors. During heavy rain, some rainwater may enter the door through the gap between the window glass and the door. If the drain holes are blocked, rainwater will accumulate inside the door.