The thermal sensor is a simple diode looking device, a capsule with two wires sticking out of it. It is a thermal fuse. Once it blows, its scrap. A friend bought a 1986 Avion that had a non working fridge in it. We didn't know about fires or the recalls, but figured out the thermal fuse was blown. Using a magnifier we got the numbers off of it and some Google searching found the device at an electronics supply I think it was. He bought about four of of them, it was a dollar or so each. The fridge has a nice flame, nothing out of the ordinary and has been working fine for a couple of years now, with quite a bit of use.
These thermal fuses are similar to what is used on a lot of automobile A/C-heat blower resistor blocks. If the motor gets to dragging or draws too much current for whatever reason, or for other reasons the air circulation of the resistor is poor, the thermal fuse blows, leaving you with high speed and nothing else. Chrysler products are the worst about blowing them, the blower moves too little air on low speed to cool the resistors. I solved the issue by soldering a 14 gauge copper wire across the fuse, and cutting out the resistor for low speed. Remaining resistors could not generate enough heat to blow the fuse if it had one, and the fan generates enough air flow to cool the remaining two resistors. But I digress..................
It is possible to identify the thermal fuse and replace it..........
2007 Winnebago View 523H, 2006 Dodge (Daimler-Chrysler aka Mercedes) Sprinter 3500 chassis. Bought Sept 2015 with 18K miles, Prog Ind HW30C, Prog Dynamics PD4645, Chill Grille, Fanstatic Fan Ultrabreeze, PML/Yourcovers.com deep alum trans pan, Roadmaster sway bar