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The evaporator fan should only be on when the compressor is running.
Not when the fridge is in defrost. -
it would be best to check for 120 volts while the fridge is on and not in defrost.
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There should be a light amount of frost on the cooling lines.
But if the fan isn’t working then there will normally be more frost then you would usually see.
If the fan is getting 120 volts while the fridge is on then you will have to replace the Evaporator Fan Motor.