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Re: not familar with electronic climat controles...
There is some sense to the designed arrangement. The object of using only the lower heat outputs, will be to prevent heat being applied directly to the sensors involved when the system is being controlled automatically. Otherwise an even distribution of heat could not be achieved.
It has also been established that heat directed to upper areas can cause drowsiness in the driver. My old Subaru FF1 has only heat, but fresh air can be simultaneously delivered via top vents and this is a distinct advantage.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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