I realized i didn't answer your other question.
Reciculating heaters have a cable, so no need to buy another one. The defroster lever is hooked to a cable. When the defroster is "on" you will know this by being in the down position and their will be a flap on the heater box that closes and all the warm heat only rises up through the dash vents near the glass to defrost the glass. The heat is only on, and blows through the floor when the opposite is true. Up position and flap open. The fan simply operates the fan speeds: I believe there is 3 or 4 speeds.
