If this was posted on the Diesel part of the forum, there would be instant cries to sue the mechanic of 2 years because they apparently were the last person to touch it before it broke. ( and maybe even jimmied the blower reg to get more work. )

In reality, this is might be a case of bio degradable wiring insulation or a common ground with corrosion. Look for crumbling insulation on the engine / throttle body harness, the was common in the early 90's. Very odd things can occur when a ground point that has many wires leading to it becomes insulated from the body and one circuit back feeds another.