Help - AC droning after cabin air filter change (1 Viewer)

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Joined
Jun 24, 2019
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Location
San Carlos, CA
My mechanic changed the cabin air filter on my 2017 (something he has done before) and now I hear a droning noise when the AC fan is on high. Turning the fan down reduces the noise, and the noise goes away entirely if the fan is off. Thoughts on the cause? TIA
 
Maybe there was something on top of the filter, and when he pulled the filter out, it fell into the impellor of the fan. Maybe pull the filter out, use a mirror to look down into the fan.
 
Maybe there was something on top of the filter, and when he pulled the filter out, it fell into the impellor of the fan. Maybe pull the filter out, use a mirror to look down into the fan.

Sounds likely to me.
 
It could be something hanging or hitting the little impeller fan right below the filter. Like someone suggested, something may have fallen into the fan or hanging from the filter into the fan area and hitting it.
 

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