Hello was hoping to get some help. My 4 year old freezer only gets down to 20 degrees. So ice and ice pops will not freeze. I changed the defrost thermostat . It was a used unit and when I opened the back I noticed the fan would not stop running and also the defrost thermostat was not connected to anything but itself. So whoever tried to repair it obviously didnt know what they where doing. Now with new thermostat installed I noticed the fan shuts off but temperature gets up to 30 degrees.