yes, that's a Thermistor. it functions as a sort of thermostat for RV fridges. pay close attention to the specific cooling fin upon which it is mounted. if you find the need to remove it be sure you reattach it to the same fin. the idea is that sliding the thermistor up and down on the fin will increase/decrease the fridge cooling. can't recall which direction causes which to happen but a call to either Dometic or Norcold will get you that answer.
2016 Itasca Suncruiser 38Q