Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 47. HVAC SYSTEM (HEATER, VENTILATOR AND AC) 01. Heater System
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W1860BE.book Page 2 Tuesday, January 28, 2003 11:01 PM
HEATER SYSTEM
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
1. Heater System
A: GENERAL
The Impreza's HVAC system uses a semi-central control type integral air conditioning unit con-
sisting of a thin-wall, high-performance heater core at the front and evaporator core at the rear. Be-
ing compact in size, this unit enables providing sufficient front passenger's legroom while ensuring
a high air-distribution efficiency by minimizing air flow resistance in all air passages. Overall, the
system can create comfortable interior air conditions quietly and in all seasons by its excellent heat-
ing, cooling, ventilating, and defrosting performances.
There are four ventilation grilles in the dashboard; two trapezoidal grilles at the center and round
grilles at both sides. The side grilles are rotatable for air flow direction adjustments.
To ensure adequate ventilation, large-size air outlets are provided behind the side portions of the
rear bumper where high-level vacuums are generated during driving.
A clean air filter is placed at upstream of the blower fan.
AC-2
W1860BE.book Page 3 Tuesday, January 28, 2003 11:01 PM
HEATER SYSTEM
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
(2)
(1)
(1)
(4)
(3) (3)
AC-00682
(1) Side defroster (3) Side ventilation grille
(2) Front defroster (4) Center ventilation grille
1. SPECIFICATIONS
Heating type Heating perfor- Blower power Maximum blower capacity (m3/h)
mance (W) consumption (W)
VENT HEAT DEF
Outside air mixing type 5000 200 450 280 300
(full-air-mix type)
AC-3
W1860BE.book Page 4 Tuesday, January 28, 2003 11:01 PM
HEATER SYSTEM
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
B: AIR FLOW MODES
(1) Side defroster
(1) (2) (1)
(2) Front defroster
(9)
(3) Foot duct
(4) Vent duct
(10)
(3) (5) Rear heater duct
(6) Heater core
(4)
(7) Evaporator
(6)
(8) (8) Blower motor
(9) Outside air
(7)
(10) Cabin air
(5) AC-00685
Switch position Heater unit door operation Switch position Heater unit door operation
DEF BILEVEL
Air flow control
AC-00119 AC-00725 AC-00122 AC-00728
Air flow control
DEF/HEAT VENT
AC-00120 AC-00726 AC-00123 AC-00729
This switch/lever allows selecting either
cabin-air-recirculation or fresh-air-intro-
FRESH/RECIRC switching
duction mode.
Models with automatic air condition-
ing
FRESH/RECIRC is changed each time
the switch is pressed.
Indicator ON: cabin air recirculation
HEAT Indicator OFF: fresh air introduction
Models with manual air conditioning
Switched by operating the lever.
AC-00121 AC-00727 AC-00124
AC-4
W1860BE.book Page 5 Tuesday, January 28, 2003 11:01 PM
HEATER SYSTEM
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
C: CONTROL PANEL
The HVAC control panel is incorporated into the center panel.
A rear window defogger switch is located in the control panel.
1. MODELS WITH MANUAL AIR CONDITIONING
The control panel uses three large-diameter, dial type switches for easy operation and good vi-
sual recognition.
(3) (6) (2) (4) (1)
(5) AC-00738
(1) Air flow control dial:
This switch allows selecting any of the five air flow modes.
AC-00127
(2) Fan speed control dial:
This switch allows turning on/off the blower and selecting any of the four blower speeds.
AC-00126
(3) Temperature control dial:
This switch allows stepless adjusting of the temperature of air delivered through ventilators.
(4) Rear window defogger switch:
This switch activates the rear defogger. When the switch is left on, a timer keeps the defogger activated for
15 minutes and then turns it off automatically.
(5) FRESH/RECIRC lever:
This lever allows selecting either cabin-air-recirculation or fresh-air-introduction.
AC-5
W1860BE.book Page 6 Tuesday, January 28, 2003 11:01 PM
HEATER SYSTEM
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
(6) Air conditioning switch:
This switch turns on or off the air conditioning compressor.
2. MODELS WITH AUTOMATIC AIR CONDITIONING
The system changes air flow, adjusts temperature and makes switching between the cabin-air re-
circulation and outside-air-introduction using servo motors.
(5) (4) (3)
(2) (1) (6) AC-00739
(1) Fan speed control dial:
In automatic air conditioning mode, the system controls the blower speed automatically in accordance with
sensor signals.
In manual air conditioning mode, this switch allows selecting any of the four blower speeds.
(2) Air flow control dial:
This switch allows selecting any of the five air flow modes.
AC-00127
(3) FRESH/RECIRC switch:
This switch allows selecting either cabin-air-recirculation or fresh-air-introduction.
(4) A/C switch:
This switch turns on or off the air conditioning compressor.
(5) Rear window defogger switch:
This switch activates the rear defogger. When the switch is left on, a timer keeps the defogger activated for
15 minutes and then turns it off automatically.
(6) Temperature control dial:
This switch allows adjusting the temperature of air delivered through ventilators.
There are 11 steps available for selection between positions 65 and 85 (vehicles for US) or between positions
20 and 30 (vehicles for Canada). The counterclockwise and clockwise extreme ends are the positions to keep
the system in the maximum cooling and maximum heating operations, respectively.
AC-6
W1860BE.book Page 7 Tuesday, January 28, 2003 11:01 PM
HEATER SYSTEM
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
D: HEATER AND COOLING UNIT
Having an evaporator core at the front and a heater core at the rear, this single unit combines both
heating and cooling functions.
The heater and cooling unit incorporates doors for creating different air flow modes and a door
for mixing heated air and outside air.
In the models with an automatic air conditioner, the air flow mode switching doors and air mixing
door are moved by electric-motor-driven actuators. The actuators are centrally controlled using a
local area network (LAN) system.
In the models without an air conditioner, the air flow mode switching doors and air mixing door are
moved by cables through corresponding linkages.
AC-00483
1. SPECIFICATIONS
Heater core size Heat output
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