Freezer side still freezing but frig side not cooling at all.

The defrost heater is located on the evaporator coil (located in the freezer compartment) and is designed to melt the frost from the coils. If there is power getting to the heater and it will not get hot, the defrost heater is most likely faulty. It should have a resistance of 20-50 ohms in most cases. Part number=> WR51X10042 Can be also purchased here=> Appliance Part Southeast
The defrost thermostat is designed to turn the power off to the defrost heater once the coils are clear of frost. It is a temperature actuated switch and once the coils are clear, the thermostat will open and the heater will be turned off. If the thermostat does not reset once it gets below freezing, it is most likely defective. Part number=> WR50X10054
Can also be purchased here=> Appliance Parts Southeast You may contact me here at Fixya or Appliance 911 or through my website SEA BREEZE APPLIANCE PARTS AND TECHNICAL SERVICES Thanks,and if you have questions or need help please let me know, Sea Breeze