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Exactly how does the dual zone heat system work? I want to figure out the most efficient setting when no one else is in the car and I'm using recirculate. Should the passenger side be turned down low or does that mix outside air to get the lower temperature? Have driven the car a lot more this winter and when in town, there is precious little engine heat available. One post showed that there are stepper motors controlling doors - one for each side. Anybody know what air flows they switch between? Outside cold, outside through heater core, inside recirculate, inside through heater core or what? And is any of the temperature control done by changing the water flow though the core? (I suppose you could ask the same type questions for A/C but not this time of year!)
