Then can "fresh" air be warmed air? Should in theory only A/C or ambient outside air blow through the center vents? I have felt warm air through the center vents with the heater on, even though it was cold outside.Has anyone done a "map" of the climate control settings, and what vent is supposed to be doing what, at each button setting, and fan speed? I might be having a stupid attack, however, I'm never real sure, in detail, what each button setting is supposed to do, when it's functioning properly. I use the "EC" setting mostly, and the defrost. I'm sure there was heh, "intelligent design" going on in the german engineer's mind, however I'd kinda like the center vents to do whatever the side ones are doing, at all times.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson