Refridger is randomly making odd , loud, humming, fan like noise witg periods of silence in between. I have unplugged and replugged the fridge in as well as inspect the back. (No visble coils/vents, as it is all dealed) it seems like the fan located in freezer section, maybe compressor??

Not sure of age of fridge, as it was here when I moved in three years ago. Previous homeowner had no context.