1. Engine Temperature: The primary purpose of the cooling fan is to control engine temperature. When the engine reaches a certain temperature, usually around 210-220 degrees Fahrenheit, the fan will automatically turn on to draw air through the radiator and dissipate heat. This helps to keep the engine from overheating.
2. Radiator Condenser: In modern vehicles, the radiator is often mounted in front of the air conditioning condenser. When the air conditioner is turned on, the condenser needs airflow to cool down the refrigerant gas. The cooling fan will often operate while the air conditioner is on, even if the engine temperature is relatively low, to ensure proper cooling for both the engine and the air conditioning system.
3. Vehicle Speed: Some Cadillac models may have cooling fans that are also influenced by vehicle speed. At higher speeds, the airflow is sufficient to cool the engine and condenser, so the fan may turn off or operate at a lower speed. As the vehicle slows down or comes to a stop, the fan will turn on to provide additional airflow.
4. Faulty Temperature Sensors: If the coolant temperature sensor or fan switch is faulty, it may send an incorrect signal to the fan control module, causing the fan to turn on at the wrong time or not turn on at all. This requires further diagnosis and repair or replacement of the faulty sensor or switch.
