How to Troubleshoot & Replace Samsung AP5579174 / DA32-00024W Refrigerator Temperature Sensor

First of all thanks to Wendee for all her help. I had called Samsung about my issue asked them if there was a heater to defrost the evaporator they told me no there wasn't. That's when I contacted Appliance parts pros who I found on google. Chatted with Wendee and she walked me through the problem I was having. Ordered heater, thermal fuse, and temp sensor replaced all three and frig are working as it should thanks again for all your help. 

Replaces heater and thermostat. 

I replaced defrost sensor, the defrost heater and the defrost clip. 

We noticed when we 1st moved into our home that the refrigerator was not cold enough. I called an appliance serviceman who told me to let it defrost and showed me how to check the error codes. If you do research you will find out that this is a common issue with Samsung refrigerators. I bought the defrost kit from AppliancePartsPros.com and put it on myself. It came on the 2nd day. By that time my refrigerator was completely defrosted. It was not difficult at all. I am so glad I took this route. There are so many videos on YouTube that will walk you through the process. Fortunately, I was able to save myself 400 - 500 dollars. I would also advise checking after a week or so to ensure the product is working. Other than that all is well. Thanks APP, RR 

Watched a video of people with the same problem. Ordered a new defrost heater, sensor, and thermostat. Parts came right on time and in good condition. Took probably 20 minutes to replace parts. So far working great. Waiting to see if the problem is fixed.