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climate control diagnostics

Yes, I have seen the mechanic go into diagnostic mode with the climate
control.  I don't remember the sequence of button strokes to get there
but I think that the colder and hotter buttons are used as "previous"
and "next" keys.  The temperature displays become a simple graphics
readout.  What I remember seeing was different graphics being
displayed to denote whether a certain vent is open or shut and if the
air conditioning thermostat has engaged.