ACC question for 84 SEC

Well, heres another 126 climate control question...(searched for my qestion but found nothing conclusive) anyway, basiclly everything works fine with the A/C but now its getting a little cold and time for heat...but one problem even with the temp selecter on max and the push button on "EC" it still blows in fresh air through the A/C vents. It already has new vacuum flap control valves and all that good stuff along with a rebuilt push button panel, could the panel be devective? any ideas? Its like its stuck on air conditioning, the compressor even comes on when the "Norm" button is pressed even with the temp wheel on the hottest setting!

Thanks in advace...Scott L.