What is the reason for the BMW 3 Series fan running non-stop?
2 Answers
Fan running non-stop is due to the engine water temperature being too high or even boiling. Here is more information about high engine water temperature: 1. Causes: There are many reasons that can cause the engine water temperature to be too high or even boil, common ones include damage to electronic components in the cooling system (thermostat, cooling fan), poor radiator performance, insufficient coolant, etc. 2. Solutions: Check if the lack of antifreeze is causing the high engine water temperature. Also, check the circulation of the coolant to see if it is not flowing smoothly. Additionally, inspect components such as the water temperature sensor, water pump, thermostat, and cooling fan, as any of these could lead to high water temperature. It is recommended to visit a repair shop for maintenance.
This is quite common with the BMW 3 Series, where the fan keeps running continuously, mainly due to minor issues in the cooling system. The usual root cause is a faulty coolant temperature sensor, which detects a high-temperature signal and keeps the fan running, even though the engine temperature is actually normal. It could also be a stuck relay, preventing the fan's power from being cut off. Additionally, insufficient coolant or air bubbles in the system leading to poor heat dissipation can also trigger the fan to run at full power. Long-term operation of the fan can affect battery life, especially consuming power quickly at idle. I recommend first checking if the coolant level is sufficient with a simple visual inspection of the reservoir; if there's no improvement, then it's necessary to use a diagnostic tool to scan for fault codes, as BMW's electronic systems are quite complex. It's best to visit a repair shop promptly to address potential issues.
