I have the same exact problem as water accumilates with big rains on the right rear passenger floor pan of my 2002 525 wagon.
Rear passenger floor wet.
Hot coolant flows from the engine where heat is absorbed and taken to the car s heater core when you turn on the heater.
I ve pulled the carpet and dried under on top of and tried to treat any mildew.
I have the passenger seat taken out carpet pulled back and there is a lot of puddled water on the pan.
Causes of a wet passenger side floor mat 1.
Hers was at first damp then increasingly wet.
Bad heater core a similar problem could occur with the car s heater system.
Dam it rained like hell early this week in sf bayarea.
Today the mat was wet again with about an inch of water accumulating only on the passenger side of the rear floor.
Why floor is wet on passenger side floor mat carpet wet car smells wet in this video we will explain why your car carpet on the passenger side may be wet.
Its not wet at all anywhere else other than the rear passenger side.
I vaguely remember someone posted here with the same issue before but no practical cause solution found.
She thought perhaps a water bottle must have spilled or leaked so she soaked up the water and dried out the mat.
I was thinking it would be my.
My rear passenger floor has been getting pretty wet lately.
On both the jetta and now the golf my wife and i are having the rear passenger floor become wet.
The only other thing i can think of is the sunroof but again the stripping all seems good.
Wet rear right passenger side floor i checked the door seals and weather stripping and there doesn t seem to be a leak or gap.
Just found out my rear passenger footwell is soaking wet for unknown reason.