... once you get to it.
The heater blower in the car went inop a while back. Normal checks were inconclusive. Blowing the fuse must have been a recurring problem because the car ships with a resettable fuse (circuit breaker?). But that hadn't popped.
The good news is the motor still works. All I need to do is cut out the cooked wire section and splice in a new wire & connector. Then clean up the corrosion on the connector and reassemble the parts. From here it's a twenty five cent fix.
Power is an I2R equation. When I (current) is high, the almost any resistance is too much. The current was probably in the 20-25 amp range. Square that and multiply by 1 ohm at this connection gives 400-525 Watts. That's a lot of heat! Even that much current with a .1 ohm drop is still a lot of heat (40-52W) in such a small place.