Ge gss22jfmcww side by side refrigerator warm. The refrigerator and freezer on my ge gss22jfmcww

Question

The refrigerator and freezer on my ge gss22jfmcww side by side refrigerator are both warm. I do not hear the fan running in the freezer when I hold the light switch button in. Is it possible to replace just the fan? Could this be causing the temperature problem? It isn't the heater or ice build up. I already checked.