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excessive humidity.
add a 10 foot piece of flex duct
I have seen this where water has leaked into the ductwork and stagnated.
because that air conditioner is full of air. It is letting the air out.
The A/C extracts water from the air.
no
loose connections or the air being forced into a smaller fitting (compression) then forced through the grille
The air conditioner is low on refrigerant.
could be a bad bearing on the air conditioner clutch assembly.
Bad belt. Worn tensioner. Bad compressor.
read your owners manual. i had to also. there is only two vent settings that will not use the compressor. the vent setting with the upper and lower vent showing will use the compressor.
stick an air freshener in the interior vent