Frigidaire Not Cooling

This compressor seems to be running, it is getting warm/hot but unit is not cooling the freezer or fridge. The unit first quit defrosting last fall, I assumed the defrost timer failed. It is a second unit in the garage, therefore it was a low priority. I have gotten back to work on it now, wife needs it to keep garden veggies cool. The compressor seems to come on, at least it is getting warm. The fan in the fridge is running, but no cooling anywhere.

Any suggestions as to what the problem might be, or what I should check?