The freezing and refrigerator compartments

Question

The freezing and refrigerator compartments of my Whirlpool refrigerator began to warm up yesterday, and there is essentially no cooling today. The interior light works, and the fan on the lower par of the refrigerator in back works, but the air blowing out the back is rather cool and not warm like you would expect. The refrigerator is a Whirlpool Designerstyle 20. Any suggestions?