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Could be caused by a blown fuse, faulty relay, or a damaged fan motor.
Check the fuses and relays in the fuse box.
Fan Running Constantly:
Likely due to a faulty temperature sensor or a malfunction in the fan control module.
These components send signals to the fan to turn on or off.
Noisy Fan:
This could be caused by worn-out fan bearings, a misaligned fan blade, or debris in the fan housing.
Overheating Engine:
If the radiator fan isn't functioning, the engine may overheat in slow-moving traffic or when idling.
Diagnosing Issues:
Check Fan Operation: Start the car and let it idle. Observe if the fan starts running when the engine heats up.
Inspect Connections: Look for loose or corroded wiring connections leading to the fan.
Scan for Fault Codes: Use an OBD-II scanner to check for any error codes related to the cooling system.
Replacing the Radiator Fan.unique Auto Spares,
If the fan needs replacement:
Purchase the Correct Part: Ensure you get a radiator fan designed for your specific BMW model (e.g., 3-Series, 5-Series, X5).
Gather Tools: You'll need basic hand tools and possibly a Torx screwdriver set.
Disconnect the Battery: To avoid electrical shocks, disconnect the car battery before working.