...some normal sounds with explanations.
Buzzing - heard when the water valve opens to fill the icemaker
Pulsating - fans/compressor adjusting to optimize performance
Hissing/Rattling - flow of refrigerant, movement of waterlines, or from items placed on top of the refrigerator
Sizzling/Gurgling - water dripping on the heater during defrost cycle
Popping - contraction/expansion of inside walls, especially during initial cool-down
The motor could be wearing out.
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