I have a Samsung RB215BSSW refrigerator that is not cooling properly. The temp is holding around 40 degrees in the fridge and 23 degrees in the freezer, even after putting it on Super Cool and Super Freeze. I removed the back panel and cleaned all the dust from the coils. The fans all seem to be working. I can feel cool air in both the fridge and freezer compartments. And I'm not sure if this mean anything but I hear a clicking noise after I open and close the freezer door. I also ran the self-diagnostics by simultaneously pressing the Super Freeze and Cool buttons, and the light the comes on indicates a c-fan error. Any suggestions?