a rumbling noise was comming from the back of the fridge

I unplugged the appliance removed the back cover exposing the fan motor.Unplugged the wiring harness from the motor assembly.unbolted the fan motor mounting bracket,and removed. Next I unbolted the fan and motor assembly from the mounting bracket.( I pulled the whole bracket out so it would be easier to reinstall the motor and fan assembly,then reinstalled the bracket with the motor and fan already installed) I installed the bracket assembly with the motor and fan back to its location,plugged the wiring harnessback to the motor. replaced the bask pannel ,and plugged the 110 back in the wall socket