A failing or damaged air conditioner compressor typically emits distinct, disruptive, and alarming sounds that differ significantly from normal operation. One of the most common noises is a loud, continuous metallic screeching or high-pitched squeal caused by internal friction and failing internal bearings. You might also hear heavy rhythmic clanking or banging if internal components break loose and strike the outer steel shell. Another frequent indicator is a persistent, heavy electrical buzzing or droning sound accompanied by clicking noises as the compressor struggles and repeatedly fails to start due to electrical or mechanical seizure.
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