Rear Heater - Chevrolet 1993 Astro Passenger Owner's Manual

HTR (Heater): Most of the air comes out near the floor. The rest comes out
from the defroster vents under the windshield and at the front side windows.
This is best for cold weather.
VENT The air comes out at the vents
on your instrument panel and at your
front side windows. The air conditioner will not run. Adjust the temperature
lever for warmer or cooler air.
BI-LEV
NC:
With this, outside air comes in through the heater floor vent and
the instrument panel vents. If you move your temperature control lever
between cold and hot, cooler air will come out of the upper vents while
warmer air comes out of the floor vent. This setting is useful in cool weather
with bright sunlight.
NORM NC: This setting cools the outside air. If you first used MAX NC, use
NORM
N C
as soon as the vehicle has cooled down, so outside air will be
going through your vehicle.
MAX NC: This cools the air the fastest. Move the other lever all the way to
Cold. MAX
A/C
lets in only a little air from the outside. You can use MAX
N C at first when it's really hot outside and you need to cool
off quickly.
When the air conditioning or defrost is on, you may notice a slight increase
or decrease in engine .speed.
Rear Heater
You may have the optional rear heater. The three-speed fan switch is above
the radio. Slide the lever toward HI for warmer air in the rear area. Move the
switch to OFF to turn the system off.
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