Product review (5 stars): Whirlpool 10513803 Evaporator Motor
Whirlpool 10513803 Evaporator Motor, our Kenmore side by side refrigerator was making a rattling noise inside the freezer compartment.
A little investigating found that the evaporator motors front bushing had worn and was allowing the motor shaft to wobble from the weight of the fan blade. Replacing the motor resolved the wobble and noise. Use care when removing the old fan blade as you will need to re-install it on the replacement motor. I also recommend you mark the fan blade BEFORE you remove it so that you install it correctly onto the new motor.