Subaru Legacy (2005 year). Service manual — part 858
HVAC SYSTEM
(HEATER, VENTILATOR AND A/C)
AC
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Refrigerant Pressure with Manifold Gauge Set. . . . . . . . . . .19
Refrigerant Recovery Procedure. . . . . . . . . . . . . . . ...20
Refrigerant Charging Procedure . . . . . . . . . . . . . . . ...21
Refrigerant Leak Check . . . . . . . . . . . . . . . . . . . 24
Compressor Oil . . . . . . . . . . . . . . . . . . . . . . .25
Blower Motor Unit Assembly . . . . . . . . . . . . . . . . . .26
Blower Motor . . . . . . . . . . . . . . . . . . . . . . . .27
Power Transistor (Auto A/C Model) . . . . . . . . . . . . . . ..28
Blower Resistor (Manual A/C Model) . . . . . . . . . . . . . . 29
Heater Core. . . . . . . . . . . . . . . . . . . . . . . ...30
Control Panel (Auto A/C Model). . . . . . . . . . . . . . . . 31
Control Unit (Manual A/C Model) . . . . . . . . . . . . . . . ..32
Control Unit (Auto A/C Model). . . . . . . . . . . . . . . . ...33
Compressor. . . . . . . . . . . . . . . . . . . . . . . ...34
Condenser. . . . . . . . . . . . . . . . . . . . . . . . .36
Heater and Cooling Unit. . . . . . . . . . . . . . . . . . . 37
Evaporator. . . . . . . . . . . . . . . . . . . . . . . . .38
Hose and Tube. . . . . . . . . . . . . . . . . . . . . . ..39
Relay and Fuse . . . . . . . . . . . . . . . . . . . . . . .40
Pressure Switch (Triple Pressure Switch). . . . . . . . . . . . .41
Actuator. . . . . . . . . . . . . . . . . . . . . . . . . .42
Ambient Sensor (Auto A/C Model) . . . . . . . . . . . . . . . 43
Sunload Sensor (Auto A/C Model) . . . . . . . . . . . . . . . 44
In-Vehicle Sensor (Auto A/C Model) . . . . . . . . . . . . . . .45
Air Vent Grille . . . . . . . . . . . . . . . . . . . . . . . 46
Heater Duct . . . . . . . . . . . . . . . . . . . . . . . ...47
Heater Vent Duct. . . . . . . . . . . . . . . . . . . . . ...48
Heater Cock Solenoid Valve . . . . . . . . . . . . . . . . . .49
A/C Filter . . . . . . . . . . . . . . . . . . . . . . . . ...50
General Diagnostic Table. . . . . . . . . . . . . . . . . . ..51
AC-2
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
General Description
1. General Description
A: SPECIFICATION
1. HEATER SYSTEM
2. A/C SYSTEM
• Auto A/C model
Item
Specifications
On condition
Heating capacity
5.2 kW (4,471 kcal/h, 17,743
BTU/h) or more
• Mode selector switch: HEAT
• Temperature control switch: FULL HOT
• Temperature difference between hot water
and inlet air: 65
°C (149°F)
• Hot water flow rate: 360
2 (95.1 US gal,
79.2 Imp gal)/h
Air flow rate
320 m
3
(11,301 cu ft)/h
Heat mode (FRESH), FULL HOT at 12.5 V
Max air flow rate
460 m
3
(16,245 cu ft)/h
• Temperature control switch: FULL COLD
• Blower fan speed:
Auto A/C: 6th position
Manual A/C: 4th position
• Mode selector lever: RECIRC
Heater core size
(height
× length × width)
264
× 110 × 27 mm
(10.4
× 4.33 × 1.06 in)
—
Blower motor
Type
Magnet motor 220 W or less
12 V
Fan type and size
(diameter
× width)
Sirocco fan type
150
× 75 mm (5.91 × 2.95 in)
—
Item
Specifications
Type of air conditioner
Reheat air-mix type
Cooling capacity
5.3 kW (4,557 kcal/h, 18,084 BTU/h)
Refrigerant
HFC-134a (CH
2
FCF
3
) [0.4
±0.03 kg
(0.88
±0.07 lb)]
Compressor
Type
Scroll, constant volume (SCSA 08C)
Discharge
74.5 cc (4.55 cu in)/rev
Max. permissible speed
9,000 rpm
Magnet clutch
Type
Dry, single-disc type
Power consumption
35 W
Type of belt
H4 model: V-belt 4 PK
H6 model: V-belt 6 PK
Pulley dia. (effective dia.)
93 mm (3.7 in)
Pulley ratio
1.43
Condenser
Type
Corrugated fin (Sub cool type)
Core face area
0.186 m
2
(2.002 sq ft)
Core thickness
16 mm (0.63 in)
Radiation area
5.49 m
2
(59.09 sq ft)
Receiver drier
Effective inner capacity
190 cm
3
(11.6 cu in)
Expansion valve
Type
Internal equalizing
Evaporator
Type
Single tank
Dimensions (W
× H × T)
298.6
× 151 × 38 mm (11.76 × 5.94 × 1.50 in)
Blower fan
Fan type
Sirocco fan
Outer diameter
× width
150
× 75 mm (5.91 × 2.95 in)
Power consumption
220 W
AC-3
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
General Description
• Manual A/C model
Condenser fan (Sub fan)
Motor type
Magnet
Power consumption
H4 model: 90 W
H6 model: 160 W
Fan outer diameter
H4 model: 300 mm (11.8 in)
H6 model: 320 mm (12.6 in)
Radiator fan (Main fan)
Motor type
Magnet
Power consumption
H4 model: 90 W
H6 model: 160 W
Fan outer diameter
H4 model: 300 mm (11.8 in)
H6 model: 320 mm (12.6 in)
Idling speed (A/C ON)
MPFI model
SOHC model: 800
±100 rpm
DOHC model: 825
±50 rpm
3.0 L model: 770
±50 rpm
Triple switch
(Pressure switch)
Low-pressure switch
operating pressure
ON
→ OFF
196
±20 kPa
(2.00
±0.20 kgf/cm
2
, 28.4
±2.9 psi)
OFF
→ ON
225
+25
−29
kPa
(2.29
+0.25
−0.30
kgf/cm
2
, 32.6
+3.6
−4.2
psi)
High-pressure switch
operating pressure
ON
→ OFF
3,140
+50
−200
kPa
(32.02
+0.51
−2.04
kgf/cm
2
, 455.4
+7.25
−29.0
psi)
OFF
→ ON
2,550
±200 kPa
(26.00
±2.04 kgf/cm
2
, 369.8
±29.0 psi)
Middle-pressure switch
operating pressure
ON
→ OFF
1,370
±120 kPa
(13.97
±1.22 kgf/cm
2
, 198.65
±17.35 psi)
OFF
→ ON
1,770
±100 kPa
(18.05
±1.02 kgf/cm
2
, 256.81
±14.50 psi)
Thermo-control amplifier working temperature
(Evaporator outlet air)
(1) ON
(2) OFF
(3) 1
±0.5°C (33.8±0.9°F)
(4) 4
+1.5
0
°C (39.2
+2.7
0
°F)
Item
Specifications
Type of air conditioner
Reheat air-mix type
Cooling capacity
5.3 kW (4,557 kcal/h, 18,084 BTU/h)
Refrigerant
HFC-134a (CH
2
FCF
3
) [0.4
±0.03 kg
(0.88
±0.07 lb)]
Compressor
Type
Scroll, constant volume (SCSA 08C)
Discharge
74.5 cc (4.55 cu in)/rev
Max. permissible speed
9,000 rpm
AC-00601
(1)
(2)
(3)
(4)
AC-4
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
General Description
Magnet clutch
Type
Dry, single-disc type
Power consumption
35 W
Type of belt
V-belt 4 PK
Pulley dia. (effective dia.)
93 mm (3.7 in)
Pulley ratio
1.43
Condenser
Type
Corrugated fin (Sub cool type)
Core face area
0.186 m
2
(2.002 sq ft)
Core thickness
16 mm (0.63 in)
Radiation area
5.49 m
2
(59.09 sq ft)
Receiver drier
Effective inner capacity
190 cm
3
(11.59 cu in)
Expansion valve
Type
Externally equalizing
Evaporator
Type
Single tank
Dimensions (W
× H × T)
298.6
× 151 × 38 mm (11.7 × 5.94 × 1.50 in)
Blower fan
Fan type
Sirocco fan
Outer diameter
× width
150
× 75 mm (5.91 × 2.95 in)
Power consumption
220 W
Condenser fan (Sub fan)
Motor type
Magnet
Power consumption
90 W
Fan outer diameter
300 mm (11.8 in)
Radiator fan (Main fan)
Motor type
Magnet
Power consumption
90 W
Fan outer diameter
300 mm (11.8 in)
Idling speed (A/C ON)
MPFI model
800
±100 rpm
Triple switch
(Pressure switch)
Low-pressure switch
operating pressure
ON
→ OFF
196
±20 kPa
(2.00
±0.20 kgf/cm
2
, 28.4
±2.9 psi)
OFF
→ ON
225
+25
−29
kPa
(2.29
+0.25
−0.30
kgf/cm
2
, 32.6
+3.6
−4.2
psi)
High-pressure switch
operating pressure
ON
→ OFF
3,140
+50
−200
kPa
(32.02
+0.51
−2.04
kgf/cm
2
, 455.4
+7.25
−29.0
psi)
OFF
→ ON
2,550
±200 kPa
(26.00
±2.04 kgf/cm
2
, 369.8
±29.0 psi)
Middle-pressure switch
operating pressure
ON
→ OFF
1,370
±120 kPa
(13.97
±1.22 kgf/cm
2
, 198.65
±17.35 psi)
OFF
→ ON
1,770
±100 kPa
(18.05
±1.02 kgf/cm
2
, 256.81
±14.50 psi)
Thermo control amplifier working temperature
(Evaporator outlet air)
(1) ON
(2) OFF
(3) 1
±0.5°C (33.8±0.9°F)
(4) 4
+1.5
0
°C (39.2
+2.7
0
°F)
AC-00601
(1)
(2)
(3)
(4)
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