Chevrolet 1973 Monte Carlo Owner's Manual page 36

Heater
The windshield defrosting and
defogging system assists in provid-
ing good visibility through desig-
nated areas of the windshield under
most inclement weather conditions.
For immediate operation of the ve-
hicle, the windshield should be
scraped clear.
Lower Lever
Push the lower lever (Tempera-
ture) as required to give the desired
degree of heat. Full right position
provides maximum heat. Move the
defroster lever (upper) to the right
when windshield defrost is needed.
When this lever is in the OFF posi-
tion, air is directed up under the in-
strument panel through a venting
door. Full right position diverts the
entire air flow to the defroster out-
lets. Vary lever as required.
Fan
The fan lever has three (3) po-
sitions from LO at the bottom to
HI at the top.
NOTE: Fan will automatically op-
34
erate (after engine coolant temper- /,
ature has reached 85 °F.) whenever
ignition switch is in the ON posi-
tion. There is no OFF position.
Operate system for 30 seconds
before switching to "DEF." This
will remove humid air from the
system and minimize rapid fogging
of the glass which can occur if
humid air is blown onto a cool
windshield.
Heater Operating Tips
• Clear snow and ice from hood
and air inlet in front of wind-
shield to improve heater and de-
froster efficiency and reduce the
probability of fogging on inside
of windshield.
• Clear windshield, rear window,
outside mirrors and all side win-
dows of ice and snow before
driving vehicle.