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It is for filtering the air going through the heater/ac system.
A leaky heater core can do that. Also if the AC is not operative, the defrost mode can't dry the cabin air.
heater core may be partly plugged .
Over time debris and other things can collect near the heater core, its possible that something small and plastic has fallen down through the defrost vents and gets hot when the vehicle is running. You may need to disassemble the heater and remove the items and perhaps vacuum it out.
NO It has NOTHING to do with defrost.
Its not east. must take out entire dash board as the heater core is up underneath the passenger side cabin inside a case. Only way to get to it is removing everything in the way
Most people when they say "air filter" are referring to the engine air filter. Cabin air filter cleans the air that comes into the car, goes through the heater core or air conditioner and then out through the vents into the cabin of the car.
A fan on the engine blows air through hoses and into the heater box that is wrapped around the exhaust headers. The heated air from the exhaust headers in the heater box is then blown into the cabin.
No. A 2001 Jeep does not have a cabin filter.
It didn't come with a cabin filter.
That car doesn't have a cabin filter.
Probably leaking heater core.If not repairable get one from junkyard.