Refrigerator Too Warm

Thank you for all the helpful suggestions. I had not checked for coolant leakage, but I will, because the freezer seems to work fine and my experience with propane refrigerators has been with older models. I don't know about clearances and the trailer didn't come with a manual for the refrigerator. The refrigerator is original, so I hope it was installed correctly. The trailer is level, or very close to it. I am reasonably sure of the 12 volt source. Since I use propane, I think the DC line is for the control board and light. I have inspected the seal, but not tested it. How is this done? I have the adjustable temperature set at 4, but it has been long enough since I measured temperatures that I can't remember them - only that the refrigerator section seemed too warm. I hesitate to set the temperature adjustment lower since the freezer seems to be working fine - makes ice in just a few hours. I will measure temperatures again with a better thermometer and then see what happens when the thermistor is unclipped. I will also check to make sure I have a blue flame from the burner. Thank you again for the many suggestions.

JRMunn