What causes water accumulation under the rear floor mats of a Sylphy car?

[Jocelyn]

Water under the floor mats of a Sylphy is typically caused by leaks from the cabin drain plug, sunroof drainage pipe, door seals, heater core antifreeze leakage, or damage/misinstallation of the air conditioning drainage pipe. To address water accumulation under the car mats, first remove the soaked mats and then clean out any remaining water inside the vehicle. Additional information: Solutions: If the water ingress is not severe, after removing the accumulated water, simply open the windows on sunny days to allow thorough drying. Park the car in a sunny area with the doors open for ventilation, or adjust the air circulation system to internal circulation to expel moisture from the cabin through the AC system. If the water ingress is serious, or if a musty odor persists after drying, it indicates that the flooring beneath the mats, including foam materials, has also absorbed moisture and may be moldy.