Details: The tech inspected the fuses and relays
for the air compressor and blower motor. All of them were found
to be good. He then traced the power wire to the motor to check
for B+ power – there was power to the motor. Next, he unplugged
the harness from the blower motor resistor and found the power
wire pin was burnt and melted.
Confirmed Repair: The tech replaced the resistor
and installed a new wiring harness pigtail. He retested the
blower motor and it was operating on all fan speeds.