How to fix a hot fridge?

I have a fridge that heats up instead of cooling down. Would coolant solve my problem? I have already tried changing the temperature knob %26amp; leaving it on for 24 hours, but no change. And yes, the fridge does have power, the light comes on and it hums like it's running.How to fix a hot fridge?If its actually producing heat, there may be a refrigerant problem. If its just not cooling, it could be a few things ie; compressor, fans, valves etc. Depending on the style of fridge, it could be stuck in a hot gas defrost cycle. If the freezer isn't working either, its most likely the refrigerant or the compressor. Ensure the coil on the back of the fridge is clean or the refrigerant wont be able to get rid of the heat from the compartment. Hope this helps you get to the problem.