Causes of a wet passenger side floor mat 1.
Rear passenger seat floor wet.
Not sure where it s coming from.
No water found on the floor of the front passenger seat nor directly behind it is there water in the spare tire well of your trunk.
I couldn t believe the amt of water that squeezed out.
Where the heels of your feet would reside of the rear passenger.
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That will cause water to run down behind the rear seat puddle under the seat and ultimately the floorboard in the rear.
Sunroof drains have been checked.
By the look of the coorostion on the foam it appears to originate in the back portion of the floor pan i e.
The moon roof and door edges are completely dry.
Hot coolant flows from the engine where heat is absorbed and taken to the car s heater core when you turn on the heater.
If the seal is at all leaking when water rain is channeled by it it sucks the water in and down the vent and out the vent under the passenger seat.
I have the passenger seat taken out carpet pulled back and there is a lot of puddled water on the pan and the foam is soaked.
Carpet is soaking wet behind the passenger seat.
The wetness on the car floor is noticed during hot summer too.
I had to take out the passenger seat cut the carpet along the crossmember fold the carpet back and remove the jute backing to wring it out.
My 99 1 8l turbo automatic usa passat is always wet on the rear passenger side right on back passenger side rain or shine.
The heater core is like a small radiator.
If they are wet chances are the rear deck drain line is leaking into the trunk.