i have taken this thing apart and i think i may have to break the wire off of the old bulb and solder in a new bulb..... correct me if im wrong on this please! it is the heat and a/c controlls where you can have the driver side cold and the passanger side hot. here is the picture for it. (sorry its the best i could find) http://image.trucktrend.com/f/851194...board_wood.jpg