does the fan only go on hi speed?, if so then its the resistor , two screws on an oval shaped plate under the heater box, below glove box, with a plug of about 4 wires.pvdean said:Fuses okay, I am going to take out the inside filter and clean it. I believe a resister is located on the heater that if I had not changed the filter could have overheated and burned out. Any thoughts?