What makes a compressor loud?

A residential refrigerator or air conditioning compressor can become unusually loud and noisy due to several mechanical and electrical faults. Common culprits include worn-out internal motor bearings that produce a high-pitched squeal, loose rubber mounting grommets or feet that allow the heavy compressor housing to vibrate violently against the metal cabinet frame, or an electrical start relay component failing and causing a repetitive clicking noise as it struggles to engage the motor. Furthermore, running with a low refrigerant charge can strain the pump. You can troubleshoot by feeling for vibrations and listening to sound patterns. You can verify that the noise issue is addressed when tightening mounting brackets, replacing worn rubber grommets, or installing a new start relay restores quiet, smooth operation to your appliance.