This used heater fan switch mounts to the rear of the heater control panel. It is a good working switch, wiring pigtail, and plug. Also, because it is original, it will fit right the first time. Save your knob, because this part does not come with one. If you don't have the knob, its OK, I know where you can get a mint set.
KNOBS. Replaces part # D1ZZ-18578-A.