SUBARU LEGACY 1997 Service Repair Manual

G4M0640
13. Receiver Drier
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Discharge refrigerant using refrigerant recovery system.

3) Disconnect pressure switch harness

1.
4) Disconnect pipes

2.
5) Remove mounting bolt

3and remove receiver drier.
CAUTION:
The receiver drier contains a desiccant. Be sure to put
a blind plug in the detached receiver drier to protect it
from moisture.
6) Install the receiver drier in the reverse order of removal.
7) Charge refrigerant.
G4M0641
14. Evaporator Unit
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Discharge refrigerant using refrigerant recovery system.

3) Disconnect discharge pipe, suction pipe and grommets.
B5M0025
4) Remove glove box and pocket back panel. [W1A0].>
G4M0642
5) Disconnect the harness connector from evaporator.
6) Disconnect drain hose.
7) Remove evaporator mounting bolt and nut.
8) Install the evaporator in the reverse order of removal.
9) Charge refrigerant.
36
4-7SERVICE PROCEDURE
13. Receiver Drier - 14. Evaporator Unit

G4M0640
13. Receiver Drier
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Discharge refrigerant using refrigerant recovery system.

3) Disconnect pressure switch harness

1.
4) Disconnect pipes

2.
5) Remove mounting bolt

3and remove receiver drier.
CAUTION:
The receiver drier contains a desiccant. Be sure to put
a blind plug in the detached receiver drier to protect it
from moisture.
6) Install the receiver drier in the reverse order of removal.
7) Charge refrigerant.
G4M0641
14. Evaporator Unit
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Discharge refrigerant using refrigerant recovery system.

3) Disconnect discharge pipe, suction pipe and grommets.
B5M0025
4) Remove glove box and pocket back panel. [W1A0].>
G4M0642
5) Disconnect the harness connector from evaporator.
6) Disconnect drain hose.
7) Remove evaporator mounting bolt and nut.
8) Install the evaporator in the reverse order of removal.
9) Charge refrigerant.
36
4-7SERVICE PROCEDURE
13. Receiver Drier - 14. Evaporator Unit

B4M0099A
B: DISASSEMBLY AND ASSEMBLY
1) Remove resistor assembly
1and remove six screws
from evaporator case.
B4M0100A
2) Remove thermostat
1from upper case. (Thermistor
2
is inserted into specified evaporator fin position.) When
installing thermostat, be sure to insert thermistor into speci-
fied fin position.
B4M0101A
3) Disconnect the connection between the expansion
valve and pipe from receiver drier.
4) Remove the expansion valve from pipes.
5) To install expansion valve, reverse removal procedures.
Properly wrap capillary tube of expansion valve with seal.
6) Check to see if the evaporator fins are clogged. If they
are, clean them with compressed air.
CAUTION:
Water must never be used to clean the evaporator.
7) Check parts that have been removed for cracks or
scratches, and repair or replace them with new ones, if
necessary.
8) Reassemble the evaporator in the reverse order of dis-
assembly.
NOTE:
Confirm that the O-ring is inserted in the specified position.
37
4-7SERVICE PROCEDURE
14. Evaporator Unit

B4M0102A
15. Condenser Fan Assembly
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Disconnect harness connector from fan motor.
3) Remove condenser fan bolt from radiator.
4) Pull condenser fan assembly.
5) Install the condenser fan assembly in the reverse order
of removal.
Tightening torque:
T: 7.4±2.0 N⋅m (0.75±0.2 kg-m, 5.4±1.4 ft-lb)
B4M0103
B4M0764
16. Flexible Hose
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Discharge refrigerant using refrigerant recovery system.

3) Remove low-pressure hose.
(1) Remove hose attaching bolts.
CAUTION:
Plug the opening to prevent foreign matter from get-
ting in.
(2) Disconnect the connector at evaporator module.
4) Remove high-pressure hose.
(1) Disconnect hose attaching bolt (compressor side).
(2) Disconnect hose attaching bolt (condenser side).
CAUTION:
Plug the opening to prevent foreign matter from get-
ting in.
5) Installation is in the reverse order of removal.
6) Charge refrigerant.
38
4-7SERVICE PROCEDURE
15. Condenser Fan Assembly - 16. Flexible Hose

B4M0102A
15. Condenser Fan Assembly
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Disconnect harness connector from fan motor.
3) Remove condenser fan bolt from radiator.
4) Pull condenser fan assembly.
5) Install the condenser fan assembly in the reverse order
of removal.
Tightening torque:
T: 7.4±2.0 N⋅m (0.75±0.2 kg-m, 5.4±1.4 ft-lb)
B4M0103
B4M0764
16. Flexible Hose
A: REMOVAL AND INSTALLATION
1) Disconnect battery negative terminal.
2) Discharge refrigerant using refrigerant recovery system.

3) Remove low-pressure hose.
(1) Remove hose attaching bolts.
CAUTION:
Plug the opening to prevent foreign matter from get-
ting in.
(2) Disconnect the connector at evaporator module.
4) Remove high-pressure hose.
(1) Disconnect hose attaching bolt (compressor side).
(2) Disconnect hose attaching bolt (condenser side).
CAUTION:
Plug the opening to prevent foreign matter from get-
ting in.
5) Installation is in the reverse order of removal.
6) Charge refrigerant.
38
4-7SERVICE PROCEDURE
15. Condenser Fan Assembly - 16. Flexible Hose

G4M0649
17. Relay and Fuse
A: LOCATION
Relays used with A/C system are located as shown in fig-
ure.
1) A/C relay
2) Main fan (radiator fan) relay
3) Sub fan (condenser fan) relay
4) Sub fan (condenser fan) water temperature relay
5) Fuses (10 A and 20 A)
G4M0651
B: INSPECTION
1) Check conduction with a circuit tester (ohm range)
according to the following table in figure.
B4M0105A
2) Replace relays which do not meet specifications.
39
4-7SERVICE PROCEDURE
17. Relay and Fuse

G4M0654
18. Pressure Switch (Dual Switch)
Pressure switch is attached to receiver dryer.
A: INSPECTION
1) Remove cap from high-pressure line service valve, and
connect gauge manifold to service valve.
2) Disconnect pressure switch harness connector, and
check pressure switch for proper ON-OFF operation. Use
a circuit tester.
Terminal OperationHigh-pressure side line pressure
kPa (kg/cm2, psi)
High and low pressure
switch

1—
2
Turns OFF.Increasing to
2,648±196 (27±2, 384±28)
Decreasing to
177±20 (1.8±0.2, 26±3)
Turns ON.Increasing to
186±29 (1.9±0.3, 27±4)
Decreasing to
1,471
+196
98(15+2
1, 213+28
14)
40
4-7SERVICE PROCEDURE
18. Pressure Switch (Dual Switch)

1. Air Conditioning System Diagnosis
41
4-7DIAGNOSTICS
1. Air Conditioning System Diagnosis

2. Performance Test Diagnosis
If various conditions caused to other air conditioning
system, the characteristics revealed on manifold gauge
reading are shown in the following:
As to the method of a performance test, refer to the item
of“Performance Test”.
Each shaded area on the following tables indicates a read-
ing of the normal system when the temperature of outside
air is 32.5°C (91°F).
Condition Probable cause Corrective action
INSUFFICIENT REFRIGERANT CHARGE
G4M0673
Insufficient cooling Refrigerant is small, or
leaking a little.1. Perform leak test.
2. Repair leak.
3. Charge system.
Evacuate, as
necessary, and
recharge system.
ALMOST NO REFRIGERANT
G4M0674
No cooling action Serious refrigerant leak.Stop compressor
immediately.
1. Perform leak test.
2. Discharge system.
3. Repair leak(s).
4. Replace receiver
drier if necessary.
5. Check oil level.
6. Evacuate and
recharge system.
FAULTY EXPANSION VALVE
G4M0675
Slight cooling;
Sweating or frosted
expansion valve inlet.Expansion valve
restricts refrigerant flow.
Expansion valve is
clogged.
Expansion valve is
inoperative.
Valve stuck closed.
Thermal bulb has lost
charge.If valve inlet reveals
sweat or frost:
1. Discharge system.
2. Remove valve and
clean it. Replace it if
necessary.
3. Evacuate system.
4. Charge system.
If valve does not oper-
ate:
1. Discharge system.
2. Replace valve.
3. Evacuate and charge
system.
42
4-7DIAGNOSTICS
2. Performance Test Diagnosis

Condition Probable cause Corrective action
G4M0676
G4M0677
Insufficient cooling;
Sweated suction line.
No cooling;
Sweating or frosted suc-
tion line.Expansion valve allows
too much refrigerant
through evaporator.
Faulty seal of O-ring in
expansion valve.Check valve for opera-
tion. If suction side does
not show a pressure
decrease, replace valve.
1. Discharge system.
2. Remove expansion
valve and replace
O-ring.
3. Evacuate and
replace system.
AIR IN SYSTEM
G4M0678
Insufficient cooling Air mixed with refriger-
ant in system.1. Discharge system.
2. Replace receiver
drier.
3. Evacuate and charge
system.
MOISTURE IN SYSTEM
G4M0679
After operation for a
while, pressure on suc-
tion side may show
vacuum pressure read-
ing. During this
condition, discharge air
will be warm. As warn-
ing of this, reading
shows 39 kPa (0.4
kg/cm
2, 6 psi) vibration.Drier is saturated with
moisture. Moisture has
frozen at expansion
valve. Refrigerant flow
is restricted.1. Discharge system.
2. Replace receiver
drier (twice if neces-
sary).
3. Evacuate system
completely. (repeat
30-minute evacuating
three times.)
4. Recharge system.
43
4-7DIAGNOSTICS
2. Performance Test Diagnosis