A loud screeching or squealing noise coming from your air conditioning unit is usually a clear sign of a mechanical issue related to the fan motors or belts. In many residential systems, this sound is caused by a slipping, worn, or misaligned fan belt in older blower assemblies, or dry, failing bearings inside the outdoor condenser fan motor or indoor blower motor. Another potential cause is excessive internal pressure within the refrigerant system, which can trigger a safety valve to release pressure while emitting a high-frequency squealing sound. When you hear this distinct noise, you should turn off the air conditioning system immediately to prevent further damage to the motor or drive components, and call a qualified technician to inspect and replace the worn parts.
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