Would this correct a consistent high pitched noise? I have whirlpool freezer model # ev170nyls00. The noise is consistent even when opening the door or shaking the unit. Nothing stops it other than unplugging it or when the compressor shuts off.
What you could do is disconnect the overload on relay on the compressor and turn the unit on and see if the unit is still making the high pitched noise. If the noise stops then it is the compressor that is causing the noise and if the noise continues then the evaporator fan motor would be the issue.