Hello all, I just fixed my slider on my non a/c heater control for my 68 Firebird. I am not sure of the purpose of putting a cable onto the blower low/medium/high slider. I understand the following for the other 2 selectors and they work: I can hear and feel the air doors sliding open/shut in the air box for the heat/de-ice slider, and the hot/cold slider. My slider for the blower speed, low, med, high works; the blower speed changed without that third cable being hooked up. This third cable is very tight, it will snap off the stud on the slider if I hook it up. I plan to leave it off unless someone tells me a good reason to hook it up. The service manual picture is useless, it is very vague. This is kind of hard to explain, so any ideas/insight would be greatly appreciated. Thanks, Jeff