Buick 1993 LeSabre Owner's Manual page 126

Air entering the car will be evenly split between the
floor outlets and the outlets near the windshield.
The blower speed will be controlled automatically, but
you can choose another fan speed by pushing the HI or
LO
buttons.
Defrost
This setting will direct most
of the air flow toward the
windshield. Use this when
there is fog or ice on the
I
windshield.
Defrost will work better if any ice and snow is cleared
from the hood and the air inlet area between the hood
and the windshield.
Blower speed will be controlled automatically, but you
can choose another speed by pushing the HI or LO
buttons.
Rear Window Defogger (Option)
The lines
you see
on the
rear window warm the
glass. Press the button to
start warming your
window. After
10
minutes,
it will go
off
by itself or,
pressing the button again
during the heating cycle
will shut it off. If you need
additional warming time,
push the button again.
If you have the heated outside rearview mirror option,
the mirror will be warmed when the rear defogger is on.
I
NOTICE:
Scraping the inside of your rear winoow could
cut and damage the heater. Your warranty wou'"
not cover this damage. Don't put decal? +here,
you might have to scrape them off.