1978 w/out factory AC
Four control knobs, three illumination lights with dash lights (two on left, one on lower right) and top right illuminates when fan is on.
Took me a bit to understand the symbols on the blue bar. The left symbol is the center dash vent (all fresh air directed there). The right symbol (up and down arrows) allows the air to be directed to either the top vents or the foot vents dependent on the position of the lower black knob.
To shut off all fresh air you move the top left lever all the way left, directing all air to the center vents, then shut the center vents.
Clear as mud?
