Disconnect the cable from the negative battery terminal. Caution: If the stereo in your vehicle is equipped with an anti-theft system, detach the cable. For 1979 through 1981 models, remove the dashboard under tray screws and tray, side air duct, heater control cable, and heater blower motor unit. Installation is the reverse of removal. For 1982 through 1986 models, remove the glove box, passenger side lower trim panel, center duct, resistor, motor unit, blower motor, and housing. Installation is the reverse of removal. For 1987 and later models, remove the glove box, passenger side lower trim panel, cover from the blower motor housing, and blower motor. Installation is the reverse of removal.