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Temperature sensors are installed in strategic locations near the radiator or engine to accurately monitor temperature. When the temperature reaches or exceeds 194°F, the sensor will send a signal to the control module and it will turn on the radiator fan for heat dissipation. As the heat dissipates, the engine temperature begins to drop. When the temperature drops to 176°F or below, the sensor will send a signal back to the control unit and the control unit will turn off the radiator fan to save energy and reduce noise. Please check the ideal operating temperature of your vehicle first. The temperature must be suitable before you can use it. Do not use it in conditions that exceed the working field of the sensor to avoid damaging the sensor or affecting the performance of the car.