Pontiac 1957 Owner's Manual page 22

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fortable temperature in the
car.
Even though the car has been
standing in the cold it is not necessary to move the
"TEMP"
lever,
because this setting will produce as much heat as "HIGH" while
bringing the air temperature up to the setting.
Air Control- The air that is heated and circulated through the car
is outside
air
drawn into the car; the Venti-Heat System does not
recirculate stale air. The
"AIR"
control regulates the entry of outside
air through the underseat unit and
'
d efroster
unit.
Moving the lever to
the
"OFF"
position closes the
air ';alve.
Moving the lever to either the
"NORMAL" or
"DE-ICE"
position opens
the
air
valve.
The "AIR" control lever when moved from the
"OFF"
position towards
"NORMAL" allows
i\Il
increasing
amount
of unheated air to be dis-
charged through the defroster nozzles until the "NORMAL" position
is
reached.
As the control lever is moved from
"NORMAL"
toward
"DE-ICE", heated air is mixed
with
the cool air in increasing amounts
until at the "DE-ICE" position
all air
discharged by the defroster
nozzles is
heated.
As the
"AIR"
control is moved from the
"OFF"
position, the valve controlling the
air
flow through the
healer
is
opened
fully and remains this way even when the control is
in
the
"DE-ICE"
position.
De-Icing Windshield-Moving the "AIR" control lever to the
"DE-ICE" position
forces heated
outside
air through the windshield
defroster and defroster ducts to clear
the
windshield of ice. After
de-icing is completed the lever can be moved toward the
"NORMAL"
position if desired.
r
19
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