Refrigerator freezer not cooling

It's definitely running. No clicking sounds nor is it hot. I'll have to check amperage on compressor. I gave this fridge to my daughter so she could have a second fridge out in her garage. It had stopped cooling a while back and just needed cleaning. But now stopped cooling again. It's clean, both fans working as should, compressor is running without any clicking, not hot as it should. Could it be thermostat?

Another thing. I did remove the starter relay on compressor. There was a slight rattle when shook. Is that normal. I thought a sure sign it was bad would be a clicking sound at compressor trying to kick on and compressor being hot. Neither were present. Compressor was running fine.

@jamann if you checked and for sure the compressor is running, then the start components aren't the issue. As for the thermostat, it sounds like it is sending the call for cooling, as it should, but the system lacks the ability to answer that call. It could be lack of refrigerant, or an internal failure in the compressor. Checking the amps will tell us more. If the amps it is drawing are but a fraction of what it says the rla are supposed to be... thats a good indication that there's an internal failure on the compressor. If it is showing maybe half the rla then the issue could be the refrigerant has leaked out, and Schrader valves will need to be used to check pressures.