I had a cooling problem with my 4door Norcold a couple weeks ago. It turned out to be the thermistor. That's the thing clipped to the second fin on the ref. If you can get the model number and serial number off the frig any rv parts store can get the part or may even have it. Mine cost $24.00. I was also told the way to find out if its the thermistor is to unplug it from the frig. Behind the light should be a plug in connection unplug (light will go off) and see it frig temp starts to go down. It will take some time for all of this to happen. Good luck