[Popeye]

My upright fridge freezer {freezer on the bottom} has stopped freezing. There is still cold air being blown into the fridge and the freezer. Any help would be greatly appreciated. I also noticed in the past that the unit would shudder when it was turning itself off. I dont know if thats a part of the problem or not.

[woodchuck]

Shudder probably not part of problem. Below the evaporator fan is the evaporator coils. Remove the back cover in the freezer to observe the frost pattern. stopped up? clear? ice in one spot . frost everywhere.If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat
Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com