Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
That area is where water drains when it rains and what not. If the filter gets wet it will be a great place for mold to grow. The filters I have seen on the newer vehicles are in the dash. Usually behind the glove box area.
..or the drainage is done in a place so that the air filter won't get wet. I've had a cabin air filter on a couple of my vehicles, all have been located in the cowl area for easy access/ replacement, but they've had a sort of a small sink and a drain at the bottom of it in front of the filter, so that it should never get wet.
I've been tossing around the idea on how to do a functioning cabin air intake filter, the plastic mesh is a joke. Driving in winter roads in all the dust the cabin and windshield gets dirty way too quickly.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***