Well, after all this messing around, I know I have the flue and baffle clean. The orifice is clear. The burner tube is clean. The lighting mechanism works fine. The propane pressure is correct.The vents in the RV body are good and still, after running it for 48 hrs with the thermistor wire unplugged, the fridge is only down to 40F. The ambient air temp. has been in the 60s, so if it got up in the 90s, it wouldn't keep up at all. Only thing I can think is that somehow the refrigerant isn't circulating properly since the coils in the back get barely warm to the touch. Much cooler than others I have been around. Is it time to bite the bullet and junk this thing? What else might I try?