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The cabin air filter is located behind the glovebox on top of the blower motor. You must remove the glovebox first. After that their should be a tray of somesort sitting on top of the blower motor. Remove the tabs that hold the tray shut and you can then pull the filter out.
It would also be a good idea to pick up an antimicrobial spray solution to kill of the the mold and other allergens that are in the ac system. Any auto parts store will sell it along with your cabin air filter. The spray is $10 and the filter goes for about $20.
The cabin air filter is the filter thats filter in coming air for your heater-A/C system it is located behind your glove box in the heater box next to the blower motor you access it after removing the glove box or extending it fully down out of the way .
It could possibly be the cabin air filter is clogged, especially if it has never been changed. Aside from that it is probably one of the stepper motors that adjust the various vent gates in the air passages under the dash. Although replacing the cabin air filter on this car is fairly easy, comparatively speaking, you do have to remove the glove box in order to do it.
I hate to mention this, but there is no cabin air filter in that particular vehicle. Nor is there one available for that vehicle. Cabin air filters did not become in fashion until the last 3-4 years. If you had one, there would be a rectangular slide-out compartment right above the fan motor, on the cooler box housing. What you are seeing may be rodent infestation, common to that varient of Corolla.