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.

[SamuelLynn]

Water accumulation in the rear is quite common. Last time I helped my neighbor check his Sylphy. The most likely cause is a clogged sunroof drain pipe. The sunroof drain outlet of the Sylphy is near the A-pillar. When leaves and mud clog it, water flows into the car. Another reason could be aging door seals, especially in older cars. If you see cracks in the rubber when closing the door, you should pay attention. Additionally, if the air conditioning drain pipe comes loose, the condensed water will leak directly under the carpet, causing water accumulation when using the AC in summer. This issue needs to be addressed promptly. I suggest first using a dry towel to soak up the water, then removing the floor mats to dry the carpet, and finally going to a repair shop to check for leaks. Otherwise, mold will make it even harder to deal with.

[MaciLee]

As a veteran Sylphy owner with 10 years of experience, I've encountered this situation three times. The most common cause is clogged sunroof drainage holes leading to rainwater backflow - this car's drainage pipes on both sides of the roof are particularly prone to leaf accumulation. Secondly, check if the door seals are deformed, especially whether the drainage holes at the bottom of the rear doors are blocked by mud. Another possibility is cracked floor pan sealant, allowing water to seep up from chassis gaps during rain. Don't attempt DIY repairs - remember to first dry the car mats thoroughly to prevent mold, then have the 4S shop use an air gun to clear the pipes. When parking, try to avoid spots under large trees.

[LincolnMarie]

Excessive water accumulation in the rear of the Sylphy is mostly due to waterproofing failure. Sunroof leakage is the most common issue, as the drainage pipes are designed at the corners of the A-pillars; a slight blockage can cause water to flow inside the pillars. Aging door seals can also allow water ingress, especially if the rear door frame seals are deformed, leading to water seepage even during car washes. Once, a friend's car had a detached air conditioning condensate drain pipe on the passenger side, causing water to flow to the rear seats. Immediate action is required for water accumulation: after soaking up the water, lift the carpet to dry, and ideally remove the seats for thorough drying. Repairs involve clearing the drainage pipes, replacing seals, or reapplying sealant, which is inexpensive but prevents future water ingress.