1999 SUBARU LEGACY 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.ICheck condenser
cooling fan.
ICheck condenser for
dirt accumulation.
ICheck engine cooling
system for overheat.
ICheck for refrigerant
overcharge.
If pressure remains
high in spite of all
above actions taken,
remove and inspect
the condenser for
possible 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.
37
[K200]4-7DIAGNOSTICS
2. Performance Test Diagnosis

3. Blower Motor Diagnosis
B4M1103A
38
4-7[K300]DIAGNOSTICS
3. Blower Motor Diagnosis

4. Compressor Diagnosis
B4M1104A
39
[K400]4-7DIAGNOSTICS
4. Compressor Diagnosis

5. Compressor Clutch Diagnosis
B4M1105A
40
4-7[K500]DIAGNOSTICS
5. Compressor Clutch Diagnosis

B4M1106A
41
[K500]4-7DIAGNOSTICS
5. Compressor Clutch Diagnosis

6. Radiator Fan (Main Fan) Diagnosis
B4M1107A
42
4-7[K600]DIAGNOSTICS
6. Radiator Fan (Main Fan) Diagnosis

7. Condenser Fan (Sub Fan) Diagnosis (I)
B4M1108A
43
[K700]4-7DIAGNOSTICS
7. Condenser Fan (Sub Fan) Diagnosis (I)

8. Condenser Fan (Sub Fan) Diagnosis (II)
B4M1109A
44
4-7[K800]DIAGNOSTICS
8. Condenser Fan (Sub Fan) Diagnosis (II)