At what temperature does the BMW fan start working?
2 Answers
The fan will start rotating when the temperature reaches 98°C. The car radiator fan is automatically activated and cannot be manually controlled. It does not start at low temperatures, and operates at two speed levels for medium and high temperatures. Generally, the medium speed is automatically activated at 95°C, and the high speed is activated at 105°C. Below is the relevant information: 1. Radiator Fan: The radiator fan, or cooling fan, is controlled by a thermal switch on the radiator. When the coolant inside the radiator reaches a certain temperature, the thermal switch activates the radiator fan. When the coolant temperature rises further, the thermal switch increases the fan speed. The radiator fan automatically turns off when the coolant temperature drops below a certain level. 2. Fan Speed: When the coolant temperature reaches 95°C, the fan starts and operates at approximately 1600 RPM. When the temperature reaches 105°C, the fan speed increases to about 2400 RPM to enhance cooling efficiency.
The fan in a BMW usually starts working when the engine temperature reaches around 90 degrees. It's controlled by the coolant temperature sensor, specifically between 85 to 95 degrees, depending on the model year of your car. I remember one time my car's fan was slow to activate, causing the coolant temperature to spike and nearly damaging the engine. So, always keep an eye on the temperature gauge on the dashboard—if it hits the red zone, stop immediately. In summer heat, the fan runs more frequently. If it delays starting, it might be due to low coolant levels or a sensor issue. Early checks can prevent major repairs. Don’t underestimate this small component—it’s crucial for engine longevity.
