I laid upside down and saw the stuff you describes. The noise was coming from a small round hole in the middle of the fan casing. I put a piece of 3m tape over it and it quieted it completely up. But will this fan eventually fail? Is there anything bad about waiting for it to fail before replacing?
As easy as it is to check, I'd drop it down and make sure that actually is the issue. But yeah. If that's it... Then run it until it quits. I've never changed one without changing the motor/blade combo so if what vibration is still there doesn't bother you then leave it. I would lol
If It were me, I would change it out now. We're heading into the hot summer months and it would be just my luck for it to quit on the hottest day of the summer and the part not being available for a couple of weeks or something. It's a cheap fix and you won't have to deal with it during the summer. Just sayin' . . . . . .
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Here I am defining some causes of an buzzing noise
Breaking down compressor – The compressor in your aerating and cooling unit is the piece of your cooling framework that attempts to pressurize and cool the refrigerant in the unit. A humming sound means your compressor may not work appropriately, or that the electrical voltage coursing through your open air aeration and cooling system is not at its right amperage.
Lost or harmed disconnection feet – The compressor in your aeration and cooling system is mounted to the base of the AC unit and sits on little elastic feet (called segregation feet). Over the long haul and after proceeded with utilize, the elastic on the segregation feet once in a while splits and/or breaks down, bringing about the compressor to wind up uneven and creating an uproarious, humming commotion while working.
Solidified AC unit – Even however your aerating and cooling framework is intended to be utilized amid the most sweltering times of the year, AC units regularly solidify up. Solidifying is the aftereffect of refrigerant breaks and can bring about a humming sound to be gotten notification from your unit.
Free parts – Your aerating and cooling unit is an intricate arrangement of moving parts working in a state of harmony to cool your home. On the off chance that a section turns out to be free or is missing (e.g. free orientation), it might bring about different parts of your framework to experience the ill effects of untimely wear and cause the humming clamor you listen.