1995 SUBARU LEGACY Service Repair Manual

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climate settings bulb radio controls dead battery open trunk brake rear entertainment

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Page 905 of 2248

1. Air Conditioning System Diagnosis
43
4-7DIAGNOSTICS
1. Air Conditioning System Diagnosis

Page 906 of 2248

SUBARU LEGACY 1995 Service Repair Manual 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 pe

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.
44
4-7DIAGNOSTICS
2. Performance Test Diagnosis

Page 907 of 2248

SUBARU LEGACY 1995 Service Repair Manual 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
throug

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.
45
4-7DIAGNOSTICS
2. Performance Test Diagnosis

Page 908 of 2248

SUBARU LEGACY 1995 Service Repair Manual Condition Probable cause Corrective action
FAULTY CONDENSER
G4M0680
No cooling action;
Engine may overheat.
Suction line is very hot.Condenser is often
found not functioning
well.Check condenser
cool

Condition Probable cause Corrective action
FAULTY CONDENSER
G4M0680
No cooling action;
Engine may overheat.
Suction line is very hot.Condenser is often
found not functioning
well.Check condenser
cooling fan.
Check condenser for
dirt accumulation.
Check engine cooling
system for overheat.
Check for refrigerant
overcharge.
If pressure remains
high in spite of all
above actions taken,
remove and inspect
the condenser for pos-
sible oil clogging.
HIGH-PRESSURE LINE BLOCKED
G4M0681
Insufficient cooling;
Frosted high-pressure
liquid line.Drier is clogged, or
restriction in high-pres-
sure line.1. Discharge system.
2. Remove receiver
drier or strainer and
replace it.
3. Evacuate and charge
system.
FAULTY COMPRESSOR
G4M0682
Insufficient cooling Internal problem is in
compressor, or dam-
aged gasket and valve.1. Discharge system.
2. Remove and check
compressor.
3. Repair or replace
compressor.
4. Check oil level.
5. Replace receiver
drier.
6. Evacuate and charge
system.
46
4-7DIAGNOSTICS
2. Performance Test Diagnosis

Page 909 of 2248

3. Blower Motor Diagnosis
47
4-7DIAGNOSTICS
3. Blower Motor Diagnosis

Page 910 of 2248

4. Compressor Diagnosis
48
4-7DIAGNOSTICS
4. Compressor Diagnosis

Page 911 of 2248

5. Compressor Clutch Diagnosis
49
4-7DIAGNOSTICS
5. Compressor Clutch Diagnosis

Page 912 of 2248

SUBARU LEGACY 1995 Service Repair Manual A
Position fan switch between 1 and 4; Does con-
tinuity exist between fan switch vehicle side
connector (G/B) and ground?
Ye s
No
Faulty fan switch
Turn key switch ON.
Position fan switch betwee

A
Position fan switch between 1 and 4; Does con-
tinuity exist between fan switch vehicle side
connector (G/B) and ground?
Ye s
No
Faulty fan switch
Turn key switch ON.
Position fan switch between 1 and 4.
Turn A/C switch ON; Does 0 volt exist between
A/C vehicle side connector (G/W) and ground?
Ye s
No
Faulty A/C switch or harness
Turn A/C switch OFF; Does 12 volts exist
between A/C switch vehicle side connector
(G/W) and ground?
Ye s
No
Faulty harness
Start engine.
Turn A/C switch ON; Does 0 volt exist between
evaporator thermostat vehicle side connector
(BR/Y) and ground?
Ye s
No
Faulty evaporator thermostat
Turn A/C switch OFF; Does 12 volts exist
between evaporator thermostat vehicle side
connector (BR/Y) and ground?
Ye s
No
Faulty evaporator thermostat
ECM is faulty.

50
4-7DIAGNOSTICS
5. Compressor Clutch Diagnosis

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