1970 kick panel knob function
Hey fellas, just trying to figure out the function of the knobs on the kick panels. My car is an AC car, but with the 2 kick panel knobs. From my research, factory AC cars didn't have these knobs, but I don't think my car was originally AC. I can see the lower vent open and close with the lower knob. It works properly with the push pull function. However, the upper knob...I'm a bit confused. My buddy came over, and pulled on the upper knob, and it came almost all the way out, and no resistance when pushing back in. Where is it supposed to connect to and can I get to it easily? I noticed that after he pulled the upper knob out, and then pushed it back in, warm air started coming from the dash vents, even with the heat/AC off. Is the vent stuck open now?? Where does that vent pull air from? I would assume the cowl?? Would air be coming from all dash vents (both sides and center)?
1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555