Subaru Legacy (2005 year). Manual - part 858

HVAC SYSTEM 
(HEATER, VENTILATOR AND A/C)

AC

Page

1.

General Description ....................................................................................2

2.

Refrigerant Pressure with Manifold Gauge Set.........................................19

3.

Refrigerant Recovery Procedure...............................................................20

4.

Refrigerant Charging Procedure ...............................................................21

5.

Refrigerant Leak Check ............................................................................24

6.

Compressor Oil .........................................................................................25

7.

Blower Motor Unit Assembly .....................................................................26

8.

Blower Motor .............................................................................................27

9.

Power Transistor (Auto A/C Model) ..........................................................28

10.

Blower Resistor (Manual A/C Model) ........................................................29

11.

Heater Core...............................................................................................30

12.

Control Panel (Auto A/C Model)................................................................31

13.

Control Unit (Manual A/C Model) ..............................................................32

14.

Control Unit (Auto A/C Model)...................................................................33

15.

Compressor...............................................................................................34

16.

Condenser.................................................................................................36

17.

Heater and Cooling Unit............................................................................37

18.

Evaporator.................................................................................................38

19.

Hose and Tube..........................................................................................39

20.

Relay and Fuse .........................................................................................40

21.

Pressure Switch (Triple Pressure Switch).................................................41

22.

Actuator.....................................................................................................42

23.

Ambient Sensor (Auto A/C Model) ............................................................43

24.

Sunload Sensor (Auto A/C Model) ............................................................44

25.

In-Vehicle Sensor (Auto A/C Model) .........................................................45

26.

Air Vent Grille ............................................................................................46

27.

Heater Duct ...............................................................................................47

28.

Heater Vent Duct.......................................................................................48

29.

Heater Cock Solenoid Valve .....................................................................49

30.

A/C Filter ...................................................................................................50

31.

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)