How do the heater and fresh air controls work?
There are four controls for the cabin heating system. One is the little red-knobbed handle on the floor just aft of the gearshift lever. The others are the three sliders, two black-knobbed and one red, on the dash. The top black knob controls how much fresh air is coming in. It goes from off (left) to full flow (middle) and then turns the cool air fan (up front, behind the gas tank) on low (I), med (II), or high (III) speed. The second knob controls where the cool air goes. Left is down, to your feet, middle is the dash-side vents, and right is up, to the defogger vents. There is probably some overlap between two or all three of these settings. The bottom (red) knob controls where the warm air goes. Selections are identical to the middle knob. The red lever to the rear of the shift knob controls how much hot air comes into the cabin. Down/forward is off, gradually increasing as the knob is pulled up/back, to a certain point which turns on the blower fan, located in the engine compartme
