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fuel economy. This setting also cools the air the fastest and can be used
to
keep “unwanted odors” and/or dust from entering the vehicle. When using
the air conditioner, turn off recirculation after the vehicle reaches
a
comfortable interior temperature.
When the right knob
on
the control panel is between HEAT and DEFROST,
the recirculation feature will not function.
NC
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This button, between the middle and right knobs, allows the air
coming into your vehicle
to
be cooled and directed through
the
instrument
panel vents. This setting
is
useful for normal cooling on hot days. When you
first
use
A/C
with the recirculation button pushed in,
turn
off recirculation
as soon
as the vehicle reaches a comfortable interior temperature.
Engine Coolant Heater
If your vehicle has a diesel engine,
it
is equipped with an engine coolant
heater. An engine coolant heater is optional
on
gas engine vehicles. If you
use
the engine coolant heater before starting your engine (in cold weather
(20”
F,
(-8”
C),
or lower) your heating system
will
produce warmer air
faster, to heat
the
passenger compartment
in
cold weather.
The use of an engine coolant heater also reduces
the
time
it
takes for the
engine to reach normal operating temperature, and shortens the time it takes
the heater
to
reach full output. For more information, See “Engine Coolant
Heater” in the Index.
Diesel Engine Heater Output
If
you
idle your diesel engine for a long time when it’s cold outside, your
heater may blow out cool air. This is normal. When you increase the engine
speed, your heater should blow
out
warmer air. If it doesn’t, your coolant
level
may be too low. See “Engine Coolant”
in
the
Index
to
see
how to
check your coolant level.
Rear Air Conditioning and Heating Systems (Suburban)
If your vehicle has either or both of these systems, you can increase and
decrease the air flow at the rear vents. Depending
on
the
system
you
have
and the setting selected, you can send cooled or heated air to the rear of the
vehicle.
Rear Air Conditioning (Without Rear Heater)
If your vehicle has rear air conditioning (without rear heater), the controls
are
located above the front and second seats. The front and rear overhead
controls let
you
increase and decrease the air flow
at
the rear vents.
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