I think THIS
maybe the sensor you are referring to. It keeps the evaporator under the dash from freezing up, by cycling the a/c compressor. My 93 Dynasty, my 99 Dynasty and my Camelot all use them. It is accessible from the generator area.
Before swapping parts, with a/c running, check voltage in and out of the low pressure switch, high pressure switch (if it has one) and the thermostatic switch (above.)
Actually, start at the compressor first to see if you are getting voltage to the clutch. If not, check the above mentioned switches, as they control the voltage to the compressor clutch.