You presumably refer to the interior air circulation fan? This usually doesn't operate continuously but runs for a time after the door has been open and with some fridges can be switched off.
If the fan motor has failed it should be possible to replace it but first it is best to know the motor has failed rather than the supply (timer, wiring, etc.)...
yes all modern fridges are frost free.They introduced the heater element automatic defrost system.which is controlled by the defroster timer motor,in anyones lingo more things to go wrong,hope this helps.
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