Subaru Legacy III (2000-2003 year). Service 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
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