At what temperature does the BMW's cooling fan start working?
2 Answers
BMW's cooling fan typically starts operating at low speed when the coolant temperature reaches between 93-98°C, and switches to high speed operation at 100-106°C. Due to differences in sensor placement locations and engine design across various models, the temperature thresholds for fan operation may vary. Overheating caused by insufficient coolant: When overheating occurs due to low coolant level, water needs to be added. However, to prevent engine damage, never add water immediately. First open the car's hood and engine cover to allow ventilation and heat dissipation. Only add water after the coolant temperature has decreased. Solutions when the fan isn't working: If you notice the engine overheating while the electric fan remains inactive, this indicates either a blown fuse or a faulty temperature control switch. In this situation, remember not to turn off the engine immediately. First open the hood and sprinkle cool water on the radiator to rapidly lower the coolant temperature.
I've been driving BMWs for over a decade. The cooling fan typically activates between 95 to 100 degrees Celsius, depending on the model and driving conditions. For instance, in city traffic where engine temperature rises quickly, you'll hear the fan buzzing when the dashboard shows 95 degrees - this is completely normal. Maintaining proper engine temperature is crucial as overheating can cause engine damage and increase fuel consumption. I recommend regularly checking coolant levels and the cooling system, especially during summer when you should let the fan run for a while after parking to dissipate heat. If the fan fails to activate or shows abnormal temperature readings, it might indicate thermostat or sensor issues requiring immediate inspection to avoid major repairs. Understanding this temperature threshold helps prevent many potential problems.
