What are the reasons for water ingress in the Passat Lingyu cabin floor mats?

[RicardoRose]

Passat Lingyu cabin floor mats water ingress reasons are as follows: 1. Reason one: It may be caused by leakage from the drainage plug at the bottom of the compartment, leakage from the sunroof drainage pipe, door leakage, leakage of antifreeze from the heater core, damage or improper installation of the air conditioning drainage pipe, etc. Open the engine compartment (front cover), remove the battery, and you can see the drainage hole. Remove the funnel-shaped rubber pad of the drainage hole with a screwdriver. 2. Reason two: There are also multiple possibilities, one is sunroof leakage due to poor sealing, check the sunroof; the second is water from car washing that was not cleaned properly; the third is rusting of the car's small water tank, which is used for cabin heating, leading to leakage. Remove the soaked comfort control module, blow it with an air pump, and use a towel to absorb the water from the cabin floor.