GMC 2003 Envoy - Manual (Page 151)

Y qu may notice g sJighT change in engine performance
when the air-condilionirigcomprBs&or shuts oil and turns
or^ again. This Is normal.
i Air Condllioning Off); When you (urn (he air
conditioning off, this symbol will appear on the display.
When I
he air conditioning is selected or in AUTO mode,
the system will run the ak condilioning auromatically.
Defogging and Defrosting
Fog on the insida oi windows is a result oi high humidity
(moisture) condensing on (he cool window glass. This
can be ininimizEd li the climate control system is
usad properly You can use either defog or troni defrost
10 clear fog or frost Inom your windshield.
^ (Datog)r Use ihis setting lo ctgar the window's of fog
or moisture. This setting wilt deliver arr lo iho floor
and windshield outlets.
^ (Front Defrost): Press the fronl detrost button to
defrost tho windshield. The system will automatically
control the fan speed If you select detrost front AUTO
nrrode I f the outside tampe raiure i s 40"'F (4‘"C) g r wg rm e r,
your air condilioning compressor will automatically run to
helpdehiumidify the airar>d dry Ihe windshield. Do r>gt
drive the vehicle unlil ail the windows are dear.
Rear Window Defogger
The rear window defogger uses a ■waimlnQ gad to
remove fog from the rear window.
Press this budort to turn
ihe rear window defogger
on or off.
An indicafoi light In the button will come on lo lei you
know that the rear window delogger is activated.
The rear window defogger will turn ott approKimateiy
10 minutes alter the button is pressed If you need
additional warming lime, press the button again
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