There is a sensor that turns the fan on when it detect a high degree of warm air flow or if the door is open is job is to inject cold air into the fridge compartment allowing the food to stay at cool temp as to why it ran for so long is probably collapsed sensor or faulty door switch / magnet as to it wearing its self out not to worry fans can run for months non stop with no harm the ,ain point now is ! is the fan still running it should come on when you open the door the fan is a crucial part of the fridge and must be working correctly
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