A strange noise coming from your air conditioner can be triggered by a wide variety of mechanical, electrical, or structural issues within the system. For instance, a rattling or buzzing sound often points to loose mounting screws, vibrating sheet metal panels, or debris such as twigs and leaves trapped inside the outdoor condenser cabinet. A high-pitched squealing or screeching noise usually indicates worn-out motor bearings, a slipping fan belt, or excessive pressure building up inside the sealed refrigeration lines. Furthermore, a clicking sound during startup can signal a failing electrical relay switch or a struggling capacitor, while a loud metallic banging or grinding typically points to severe internal compressor wear or a loose fan blade striking protective grilles.
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