I am guessing about the age of the appliance. It was in the trailer when I moved in 5 years ago.

The refrigerator is not getting cold air. The freezer compartment is working fine. The freezer is above the refrigerator. When the freezer door is open, cold air is blown into the refrierator section. If the freezer door is closed, no cold air is blown into the refrigerator. There is an air channel between the freezer and refrigerator at the back of the interior of the appliance. The fan in the freezer is working when the freezer door is open. I have no way of knowing if it is working when the freezer door is closed. Any ideas about what might be wrong and what possible repair costs might be.

Thanks