Nothing yet
It sounds as if you either have some debris in your blower fan or have some broken fan blades. You need to remove the blower motor and inspect the fan, clean any debris that is in the blower housing and replace any broken or worn parts.
from where, you need to say where, use a stethoscope ($5) to find spot. the engine a/c compressor air or the heater blower box or some flimsy vent. no body here can here it or guess. but many try, why not live help to find noise, and noise is a 3D , sonic experience not found here,
sounds as, but there is no sound, here. funny this....!!!
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