This thermostat controls the flow of refrigerant in the air conditioning circuit of the host tractor. It is installed in the evaporator housing and monitors the temperature of the evaporator core. When the core temperature drops to the set point, the thermostat opens the circuit to the compressor clutch, preventing the evaporator from freezing. A failed thermostat can cause the compressor to run continuously, leading to ice buildup on the evaporator and reduced cooling performance. As an original component from the manufacturer, it is calibrated to the same opening and closing temperature range as the original assembly, ensuring the clutch cycles correctly without adjustment.