Both the frig and freezer stopped cooling on my 13-year-old side-by-side unit. Both sides were room temperature and I could hear the fan running so I knew it was the fan or fan motor. I then checked the relay because I couldn't hear the compressor turning on. Turns out the relay was bad so the compressor never started. The relay was noticeably bad because it rattled when you shook it and there was a spot where it melted. Replaced the relay and it started running again! Side note, I have this frig in my garage and noticed it all of a sudden started tripping my GFCI for some reason. I used an extension cord to get around the issue to soften the signal that was tripping it but I'm guessing this was the first sign that the relay was going out.