A failing or damaged air conditioner fan motor typically produces distinct, unpleasant auditory symptoms that differ significantly from its normal smooth operation. One of the most common signs of a bad fan motor is a continuous high-pitched squealing or screeching sound, which is usually caused by lack of lubrication or worn-out internal motor bearings. You may also hear a grinding noise as the metal components wear against each other due to friction. Additionally, if the motor shaft becomes completely seized or unbalanced, it can cause a loud humming sound accompanied by a repetitive clicking as electrical current attempts to turn the stalled rotor, sometimes accompanied by a vibrating hum that echoes through the entire outdoor cabinet.
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