A failing or completely blown air conditioner compressor typically produces very distinct, disruptive, and alarming noises. Common auditory symptoms include a loud, continuous metallic screeching or high-pitched squealing caused by internal friction, severe rhythmic clanking or banging as internal parts strike the outer casing, and a heavy, droning electrical humming accompanied by a clicking sound as the unit repeatedly attempts to start but fails. If you hear these harsh sounds, the compressor has likely seized or suffered internal electrical failure and will need immediate professional diagnosis.
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