I have a 2014 RT limited, The temperature gage keeps going from all the hot to bottom of the scale cold. I am also getting P0217 fault code and the says to front radiators and coolant level and look for leaks, it also says to check thermostat. coolant level looks good along with the front radiators are not block and I have no leaks. My question is do you think i have a bad temperature sensor or a bad thermostat?