help   looks  like  cable from heatera/c temp has come off   hoe to I get to this unit,looking fro a shop manual   to  see  how this its hooked up  any help out there  .   dwaNOTE every thing was working fine when I parked it,only repair made was a new heater blower  motor. this is a 1979 coupe.

Always start where you last were.  Is it a cable or a vacuum line.  Many HVAC components are vacuum operated, depending on the car.

we have vacuum to controller confirmed. hot/cold lever moves by blowing on it its not connect it seems to lose,i called resto shop ,they said  keeper nut back of controller my have come off,yea now I have to get to cont. my service book has nothing on a/c or heater  controller.dwa