[Ian21401]

I’ve dug out my old valve. The lever operates a simple shaft which moves a disc across the bore of the valve.
The valve was mounted in a Control Housing which is what is actually secured to the bulkhead.
However, according to my notes made at the time there are two control cables. The lower control cable is operated by the dashboard heat control and moves the plastic lever and a cam which operates the valve itself and the upper cable, which, I was informed at the time, operates an air intake flap somewhere in the heater itself.
After all this time I do not fully understand those notes myself and would have to revisit the valve in the car to explain more fully, but you may have seen something on your car which makes some sense of all that.
Sorry it is so vague.