If the tank is leaking, you will see the water. Check the drain tube for a clog. On models with the freezer on top, water under vegetable pans could be a clogged defrost drain tube. My refrigerator is noisy. To minimize the possibility of electric shock, unplug this appliance from the power supply before attempting any maintenance or cleaning.
All refrigerators can moan, groan, or sizzle.
Due to higher speed compressors and other features which older model refrigerators did not have, new refrigerators make sounds that differ from those of older style refrigerators. In addition to the compressor, there are other operating parts to perform all the many modern functions of a refrigerator. These components will have sounds associated with them. It is normal to hear popping, cracking, or sizzling inside your refrigerator. Water may be dripping onto a metal shield during a defrost cycle.