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The blower motor likes to seized up due to rust. Open up the cowl/microfilter cover and gently spin the blower motor cage. Then try running it.
If it works, you can try spraying some lubricant into the shaft of the blower motor. Eventually, you'll need to replace it.
Also check the FSR (final stage resistor) as the wiring likes to burn out. There's a recall out on my car for it
Btw if it seized, don't keep the fan running. Otherwise it will eventually burn the motor out entirely and then it won't work at all/will definitely need replacement.
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