Buick 1993 LeSabre Owner's Manual page 121

Rear Passenger ComforTemp (Option)
c.
If your Buick has the Dual Automatic ComforTemp
Climate Control option, it looks like this:
If you have this option, you can adjust the direction of
the air flow to the rear seating area.
The following information tells you how it works.
You will hear a beep each time a button is pushed. The
display will show fan, temperature and mode settings.
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