Not cooling or freezing

Refrigerator & Freezer Repair
1

Brand: kenmore
Model Number: 363.58272892
Main Symptom: not cooling or freezing
What happens & when: fridge starting getting warm staying about 45 to 54 degrees fahrenheit. Freezing was freezing changed defrost heater now fridge is same and freezer is 40 to 45 degrees inside fan was running constantly now stopped

Error Code (if any):
Parts or tests already tried: defrost heater assembly
Photos / video link:

2

KCLEMENTS373, when the defrost heater was replaced, was the evaporator starting to build up with heavy frost or did it have a light frost coating? Also, what heater part number was used?

3

I threw it out to the trash bought a new one