64bb Posted April 11, 2012 Share Posted April 11, 2012 as i understand it, one unit directs airflo up or down; one unit regulates heat and ac. is there a third unit that regulates the flapper that moves between recirculating interior air and letting in fresh air??? and if so, where is it located??? and what is it called??? Quote Link to comment Share on other sites More sharing options...
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