Yes, there is a "thermistor"...also, sometimes referred to as a "thermal amp"...on the evaporator core. It's job is to detect the core temperature to prevent it from freezing. If the thermistor gets too cold, it open the power circuit to the A/C compressor clutch. I would use a gauge set to see what the high and low system pressures are before replacing the thermistor. It could be just you are a low on refrigerant (which could indicate a slow leak in the system, as well).
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