Ot mechanics and electricians

The blower motor is shorting out internally. If that's not it, then there is a short or grounding issue in the wiring.

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To the point that it breaks the circuit and the blower completely stops working.

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Does that mean the wire breaks, the fuse needs to be replaced, or that the blower stops and will work again later after the blower/AC/heater is turn d of for a while?

The blower is the first suspect, if the wiring has been replaced recently, that is also a suspect. The thing that may give me pause is ift he wiring is breaking and you are not blowing a fuse, it may be a wiring issue, if the insulation is compromised/brittle you should consider replacing the wiring or even the whole harness if possible.

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Something drawing excess current that the wire can not handle.

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Sounds like a fuse is oversized or being bypassed. It should never get to melting the wire.

But yeah, sounds like a short that someone solved by up sizing the fuse. Didn't realize the result of their actions.

Yeah it's definitely the wiring breaking. The fuse has never shot but I've replaced it anyway with the correct size fuse. 50amp if I remember right. I've replaced the blower motor itself after the graphite bushings wore out. I've replaced the resistor twice after the plugs going into it melted. The wiring that I've had to replace has been replaced with a larger gauge wire and that wire works fine, but the old wire will fail again at the location that I spliced.