1. Temperature control
Temperature control clicks when starting or stopping compressor.
2. Evaporator
"Evaporator refrigerant flow gurgles, pops or sounds like boiling water."
3. Evaporator fan motor
Evaporator sounds like rushing air.
4. Compressor
Compressor has a high pitch hum or pulsating sound.
5. Defrost Heater
"Sizzling, hissing or popping sounds."
6. Defrost Drain Pan
Dripping sounds is defrosting water falling onto drain pan.
7. Defrost Timer
Automatic timer sounds like an electronic clock that snaps in and out of the defrost cycle.