Fan doesn't work, Fan abnormal sound, Fan noise.
2.1 Fan wiring loose or damaged.
2.3 Something blocking the fan, Fan blade broken.
2.4 Fan screw loose, wire interference.
3.1 Check whether something is stuck in the fan, clean the fan.
3.2 Check if the cooling fan screws are loose, tighten the screws again.
3.3 Check if the fan is broken, No wire interference.
3.4 If it's the fan on the adapter board end, you can swap the wiring of the throat tube fan and the model fan on the adapter board end.
3.5 Use a multimeter to measure the voltage of the fan terminal (mainboard & adapter board port) to see if it's normal (around 5V).