It was making clinking sound like something was stuck and then sounded like grinding gears when the fan finally went out . You can hear the unit kick over when you turn it on but I won't work now.
Sounds like the blower motor went out, needs replacing. Possibly something got stuck in the fan blades, but doesn't sound good for the motor. If you take it out and something was jammed in the fan, test the motor with jumper wires from the battery.
SOURCE: The heater (fan) makes a loud noise.
The most obvious problem could be that something has fallen down into what is called the squirel cage of the fan.
Every once in a while a mouse will decide to build a nest there.
SOURCE: Kia Rio - Heater not working fan works but noise coming from fan.
open glove box and make sure that none of the papers from that can get down to blower motor
SOURCE: Heater Fan does not work
Sounds like the fan control knob has shorted out. You can check the fan "blower" relay and fuse in the engine compartment but you need to make sure the control knob is good or you will keep blowing fuses and relays. If your blower fuse and relay are good, then just have the control knob checked and replaced if needed.
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