My new 69 El Camino has had the 4 Seasons system mostly removed under the hood. I figure I'll fix all that as I get time and money. Since it's still winter here I'd like to have heat and defrost for now. Problem is The control panel doesn't seem to do anything except Make the fan come on. Both heater lines are getting hot, So I should have something. I've found 2 of the 3 Bowden cables. They're attached to nothing at the control box. Where do they go and what do they do? HELP!!!