7A – 28IHEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
GENERAL DESCRIPTION
AND SYSTEM OPERATION
HEATING AND VENTILATION
SYSTEMS
The base heater system is designed to provide heating,
ventilation, windshield defrosting, and side window defog-
ging. On some vehicles, it also provides heat directly to the
rear seat area.
The heater and fan assembly blower regulates the airflow
from the air inlet for further processing and distribution.
The heater core transfers the heat from the engine coolant
to the inlet air.
The temperature door regulates the amount of air that
passes through the heater core. The temperature door
also controls the temperature of air by controlling the mix
of heated air with ambient air.
The mode door regulates the flow and the distribution of
processed air to the heater ducts and to the defroster
ducts.
The console–mounted heating and ventilation control pan-
el contains three rotary control knobs and two push control
knobs which operate as follows:
Rotary Temperature Control Knob
S Actuates by cable.
S Raises the temperature of air entering the vehicle
by rotation toward the right, or the red portion of the
knob.
Rotary Mode Control Knob
S Actuates by vacuum.
S Regulates the air distribution between the wind-
shield, the instrument panel, and the floor vents.
Rotary Blower Control Knob
S Turns ON to operate the blower motor at four
speeds.
S Turns OFF to stop the blower.
S Operates completely independently from both the
mode control knob and the temperature control
knob.
S Changes the fan speed in any mode and at any
temperature setting.
Rear Window Defogger Push Knob
S Controls the rear window defogger.
S Turns On the rear window defogger when the push
knob is pressed and illuminates the indicator lamp.
Fresh Air Control Push Knob
S Operates by vacuum.
S Switches between recirculating the passenger
compartment air and bringing outside air into the
passenger compartment.
S Is normally in the fresh air mode.
S Illuminates the indicator lamp when in the recircu-
lating mode.
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