We're working on a friend's "new" 94 Cherokee and have replaced the busted heater fan motor. We then tracked why the fan only worked on "High" to an open component in the heater resistor. It's shown as a switch in the wiring diagram, and physically resembles a silicon diode. Shorting across it restored all four fan speeds. Does anyone know what that diode-looking thing is? And why it's there? I hate to buy a new resistor pack just to replace the diode (?).
- posted 15 years ago