Usualy caused by excessive current draw. Sometimes (rarely) caused by contaminated or damaged connector that has high resistance.it was the red wire right at the connection under the glove box. It melted the connector on the red wire. Just wondering what would cause this and how do I prevent this from happening again
I would be checking the current (amperage) draw of the blower motor. If it's in spec, replace the damaged wiring and move on. If the amperage draw is too high, replace the damaged wiring, replace the blower motor, verify there's no excess debris lodged in the A/C evaporator or HVAC blower-box, and move on.