Our refrigerator started making a loud humming noise which I pretty quickly located as the fan that draws air across the bottom of the unit. A quick check showed it to be the condenser motor fan. Popped off the electrical connector, remove three screws and the old one is out. I placed a small fan to blow air into the back of the unit while I waited on delivery of the new part, which came pretty quickly. Put the new fan in easy enough and problem solved. Didn’t have to shut down or unload the refrigerator.