If the refrigerator does not freeze, then it is quite possible that the problem is with freon - it could leak out. I must say right away that when I had something like this, I thought that I would have to throw this technique away. Fortunately, the wife called the masters https://hvacandapplianceguys.com/, who fixed it the same day. Everything came out at a cost much lower than buying a new refrigerator. Especially since mine was quite expensive.