Subaru Legacy III (2000-2003 year). Manual - part 864

AC-44

HVAC SYSTEM (HEATER, VENTILATOR AND A/C)

RELAY AND FUSE

B: INSPECTION

(3) — (4): Continuity exists.
(1) — (2): No continuity
While applying battery voltage to the cable be-
tween (3) and (4), check continuity between (1) and
(2).
If no continuity exists, replace the relay with a new
one.

AC-00304

1

1

2

2

3

3

4

4

AC-45

HVAC SYSTEM (HEATER, VENTILATOR AND A/C)

PRESSURE SWITCH (DUAL SWITCH)

18.Pressure Switch (Dual 

Switch)

A: INSPECTION

1) Connect the manifold gauge to the service valve
on the high-pressure side.
2) Remove the pressure switch harness connector.
Using a circuit tester, inspect the ON-OFF opera-
tion of the pressure switch.

(A) LHD model

(B) RHD model

AC-00470

2 1

2 1

( A )

( B )

Tester con-

nection

Operation

Specified condition

kPa (kg/cm

2

, psi)

High and low pressure switch

1 — 2

Turns OFF.

Increasing to
2,942

±

196 (30

±

2, 427

±

28): LHD model

3,138

±

196 (32

±

2, 455

±

28): RHD model

Decreasing to
177

±

25 (1.8

±

0.25, 25.6

±

3.6): LHD model

196

±

20 (2.0

±

0.2, 28.4

±

2.8): RHD model

Turns ON.

Increasing to
216 (2.2, 31) or less: LHD model
226

±

29 (2.3

±

0.3, 33

±

4): RHD model

Decreasing to
2,354

±

196 (24

±

2, 341

±

28): LHD model

2,550

±

196 (26

±

2, 370

±

28): RHD model

AC-46

HVAC SYSTEM (HEATER, VENTILATOR AND A/C)

PRESSURE SWITCH (TRIPLE SWITCH)

19.Pressure Switch (Triple 

Switch)

A: INSPECTION

1) Connect the manifold gauge to the service man-
ifold on the high-pressure side.
2) Remove the pressure switch harness connector.
Using a circuit tester, inspect the ON-OFF opera-
tion of the pressure switch.
LHD model

RHD model

AC-00306

4

1
2

3

Tester connection

Operation

Specified condition

kPa (kg/cm

2

, psi)

High and low pressure 
switch

1 — 2 

Turns OFF.

Increasing to 2,940

±

196 (29.98

±

2.00, 426

±

28)

Decreasing to 177

±

20 (1.8

±

0.2, 26

±

3)

Turns ON.

Increasing to 216 or less (2.2, 31)

Decreasing to 2,350

±

196 (23.97

±

2.00, 341

±

28)

Middle pressure switch

3 — 4 

Turns OFF.

1,370

±

120 (13.97

±

1.22, 199

±

17)

Turns ON.

1,770

±

100 (18.05

±

1.02, 257

±

15)

AC-00471

2 1

Tester connection

Operation

Specified condition

kPa (kg/cm

2

, psi)

High and low pressure switch

1 — 2 

Turns OFF.

Increasing to 3,140

+50

/

–200

 (32.02

+0.51

/

–2.04

, 455.3

+7.3

/

–29.0

)

Decreasing to 196

±

20 (2.0

±

0.2, 28

±

3)

Turns ON.

Increasing to 225

+25

/

–29

 (2.29

+0.25

/

–0.30

, 32.6

+3.6

/

–4.3

)

Decreasing to 2,550

±

200 (26.0

±

2.04, 370

±

29)

Middle pressure switch

3 — 4 

Turns OFF. 1,370

±

120 (13.97

±

1.22, 198.7

±

17.3)

Turns ON.

1,770

±

80 (18.05

±

0.82, 256.7

±

11.7)

AC-47

HVAC SYSTEM (HEATER, VENTILATOR AND A/C)

AMBIENT SENSOR (AUTO A/C)

20.Ambient Sensor (Auto A/C)

A: REMOVAL

1) Open front hood.
2) Disconnect ground cable from battery.
3) Disconnect ambient sensor connector.
4) Remove ambient sensor from radiator lower
panel.

B: INSTALLATION

Install in the reverse order of removal.

C: INSPECTION

<Ref. to AC-50, DTC 21 OR –21 (AMBIENT SEN-
SOR), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC) (LHD Model).>
<Ref. to AC-66, DTC 22 OR –22 (AMBIENT SEN-
SOR), Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC) (RHD Model).>

AC-00307