I replaced the cord and cut the old one apart. The wire was fine.
Apparently the trouble was where the the wire was soldered (?) to the
brass (?) spade in the plug. Cutting up that thick rubber plug was
tough enough that I didn't finish the autopsy.
The noise came from the blower's plastic impeller. It turned silently
with the power off sounded as if it were out of balance when the motor
came on. Clamping it a mm closer to the end of the shaft made it
smoother. I don't understand why.
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