What Causes Water Under the Octavia's Floor Mat?

[DeBenjamin]

The reasons for water under the Octavia's floor mat are as follows: 1. Sunroof drainage blockage leading to leakage: Initially, water accumulation may appear inside the central ceiling light cover and around the sunroof knob, with water stains on the vanity mirror of the sun visor and water in the trunk's CD compartment. In severe cases, it can cause leakage in the A-pillar and half of the ceiling interior. 2. Air conditioning condensate leakage: The main symptom is water accumulation under the floor mat in the right rear passenger footwell, with noticeable dampness in the right front passenger area as well. 3. Body weld seam adhesive failure causing leakage: Water accumulation inside the cabin and trunk after heavy rain or car washing, sometimes with significant water in the spare tire compartment. 4. Aging door and window seal strips leading to leakage: Water accumulation inside the car after overnight heavy rain or car washing.