1984-1988 Pontiac Fiero White Heater Control Overlay HVAC White hvac controls are made with the same quality plastic material our white gauges are made of. Each white heater control is specialty printed, laminated and then computer cut for a perfect fit. Some white hvac's go over the top of your stock hvac and some replace the entire face, view install instructions for info. Manufactured with a special process so overlays are transparent and use the stock lighting to light up at night.