How important is a refer thermistor?

Thanks Old Biscuit... that is a great explanation as to how the thermistor works in relation to the functions of an rv fridge. I will replace the thermistor as it is a very inexpensive part and I want the refer to operate as originally designed. If it was something that might cost several hundred dollars, I might think otherwise(jury-rig) since the refer could be used and kept cool as you state.

Thank-you for the in-depth explanation. BTW, you add a lot of very good information to this forum on many subjects!