What is the reason for water under the foot mats of the Sylphy?
3 Answers
Water under the foot mats of the Sylphy is caused by factors such as leakage from the drainage plugs at the bottom of the cabin, leakage from the sunroof drainage pipes, leakage from the doors, leakage of antifreeze from the heater core, or damage or improper installation of the air conditioning drainage pipes. It is recommended to have it inspected and repaired at a 4S shop. To deal with accumulated water under the car foot mats, you can first remove the soaked foot mats and then clean out the remaining water inside the vehicle. There are several rubber sealing plugs at the lower part of the vehicle chassis; opening these plugs can drain the accumulated water from the cabin. The Sylphy has a body length of 4665mm, a width of 1700mm, a height of 1505mm, and a wheelbase of 2700mm.
I've been driving for nearly 20 years, and water accumulation in the floor mats of the Sylphy is quite common. The most frequent issue is clogged sunroof drainage holes, especially during summer when leaves and small fruits fall into the sunroof channel. If rainwater can't drain properly, it flows down the A-pillar and under the floor mats. Another possible cause is a detached air conditioning drain pipe, which is located behind the glove box on the passenger side. If the connection loosens, the condensate water drips directly onto the floor. Additionally, aging door seals can be problematic, particularly for cars frequently parked outdoors under the sun. When the seals deform, rainwater seeps in through the door gaps during showers. I remember one time when my car's carpet even got moldy, and it turned out the sunroof drain pipe joint had cracked. Replacing the pipe cost me 200 yuan. Now, I make it a habit to regularly clean the sunroof tracks and ask the car wash to use an air gun to blow out the drainage holes. Since adopting these practices, water accumulation has become much less frequent.
When repairing cars, we often hear Nissan Sylphy owners complain about water accumulation in the floor mats, mainly focusing on three scenarios for thorough inspection. First is the air conditioning system issue – if the front passenger side is particularly wet, it's likely due to a clogged or detached AC drain hose. This hose is located under the dashboard; if its connection loosens, condensed water will leak into the cabin. Second is sunroof drainage failure – the four drainage holes (front and rear) are prone to clogging by debris, causing rainwater pooled in the tracks to leak into the car along the A-pillar or C-pillar. Third involves door sealing problems – when drainage holes at the bottom of doors get blocked or the waterproof membrane peels off, water will flow from inside the door panel onto the floor mats. For DIY solutions: use an air gun to clear sunroof drains and unclog door-bottom drainage holes with a wire. If carpets are soaked, it's best to remove and sun-dry them; otherwise, prolonged moisture will cause floor panel rust and moldy odors. If the leak source remains elusive, a professional water spray test at a repair shop becomes necessary.
