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Q:is this what makes the cooling fan come on?
A:Hi Steve, great question! the coolant temperature sensor (CTS) is often located near the thermostat of a vehicle’s engine so that it can operate at its optimum level. The tip of the coolant temperature sensor is generally located directly near the coolant of the engine. This temperature sensor works by measuring the temperature that the thermostat or coolant is giving off. The temperature that the sensor reads is then sent to the on-board computer or engine control system as a signal. The engine control system then uses the information it receives from the coolant temperature sensor to operate or adjust some of the functions of the engine for it to run at its optimum level. Aside from regulating the temperature of the engine by turning the cooling fan on and off, the information received from the temperature sensor is also used to determine if the engine needs a richer fuel mixture, to ignore the oxygen sensor rich/lean feedback signal, to open the exhaust gas recirculation or to limit the spark advance during emission.