[5String43]

At least I think the dad-blamed thing is called the auto air controller. It's the dial down there on the floor between the two seats.

Lemme see if I can 'splain this: The one in my car ('82 SC) rotates freely, with no resistance, between, say, 9 o'clock all the way 'round clockwise to 8 o'clock. Nearly a full turn. Then it encounters the resistance you might expect. It seems reasonable to assume that one is making actual adjustment to the system only when rotating the knob against resistance. Yes? No?

And why all this freeby rotation?

I've been getting unwanted heat in the cabin and, employing all this freeplay, rotated the knob back anticlockwise so that after encountering resistance, the dial rests at "0." 'Scuse me while I go take a ride to see if this last strategy has caused the heat to cease flowing. In the meantime, I'd be grateful for any comment anyone might care to make.

Thanks in advance.