Water under the cabin floor mat, where does it come from?

[SawyerLynn]

Water under the cabin floor mat may be caused by leakage from certain parts of the vehicle body. Here are the relevant explanations: 1. Clean up: Find the leaking part and repair it, and clean up the water under the cabin floor mat. There are many parts of the vehicle body with water guide grooves or drainage holes, such as doors, front windshields, sunroofs, trunk lids, etc. 2. Air conditioning water: If it is a new car, the most likely cause is air conditioning water. The car air conditioner produces a large amount of water after cooling, and this water is discharged outside the car through a drainage hose connected to the bottom of the car near the condenser. If this hose is not properly connected to the bottom of the car during production, the water will accumulate inside the car. 3. Continue driving to dry: You can start the engine and continue driving. Pay attention to using the brakes at high speed, which can help dry it quickly and avoid reduced braking performance due to water.

[MadelineAnn]

I've encountered water accumulation under the floor mats quite a few times. With over 20 years of driving experience, I can tell you the causes can be multifaceted. Rainy days are the most common culprit - clogged sunroof drainage holes may prevent rainwater from flowing into drainage tubes, causing it to seep into the cabin through windshield corners instead; aged or damaged door seals can let water leak through door gaps during heavy rain or car washes; blocked AC condensate drain tubes may cause water to accumulate under the mats when the AC is running. Untreated, this can lead to mold growth, unpleasant odors, and even rusting of the vehicle's undercarriage, compromising safety. My advice: first remove the accumulated water, then check if sunroof and AC drainage holes are clear - you can try clearing them yourself with a soft tube, or visit a repair shop for professional inspection if unsure. Never take this lightly - only a dry interior ensures peace of mind.

[VonLillian]

Bro, I've also encountered water stains under the floor mats before, mostly caused by daily use mishaps. It could be from windows not being fully closed during rain, or worn-out door rubber seals letting water seep in. Sometimes, high-pressure car wash jets force water through floor gaps. Or if the AC runs too long with a clogged drain pipe, condensation water can't drain and leaks under the mats. Not a serious issue, but needs prompt checking to prevent odor from stagnant water. When I handled it myself, I just used an air gun to clear the AC drain pipe - easy fix. Start checking these points first to save time and money. If all else fails, visit a repair shop, but don't delay too long to avoid affecting your driving mood.

[SanBeckett]

A while ago, the car floor mats got wet. Upon careful inspection, I found possible leakage points: the windshield sealant may have aged, allowing rainwater to seep in during heavy rain; the air conditioner drain pipe might be clogged, causing water to backflow; or the door seals could be cracked, letting water in. If left unrepaired, these issues can lead to mold and mite infestations, resulting in unpleasant odors that affect health. It's recommended to lift the floor mats, dry them thoroughly, identify the source of the leak, clear the drain holes, and perform regular maintenance to prevent rust.

[Andres]

From the vehicle structure perspective, common causes of water accumulation in the footwell area include: clogged air conditioning system condensate drainage leading to backflow; blocked sunroof drainage channels causing rainwater seepage; deteriorated door seals allowing water ingress; and obstructed floor drain holes. These issues require prompt attention to prevent rust and odors. Start inspections with the AC and sunroof systems, and consult a mechanic if unresolved—maintain interior dryness.