Radiator Main Fan System - Subaru Legacy 2002 Service Manual

B: INSPECTION
TROUBLE SYMPTOM:
¼ Radiator main fan does not rotate in low speed
under the following conditions:
(1) Coolant temperature 95°C (203°F) or more.
(2) A/C switch set to OFF.
¼ Radiator main fan does not rotate in middle
speed under the following conditions:
No.
1 CHECK OPERATION OF RADIATOR FAN.
1) Run the engine at idle (Vehicle stationary)
2) Turn the A/C switch to ON, set temperature
at the lowest position.
3) Inspect while coolant temperature is 94°C
(201°F) or less.
2 CHECK OPERATION OF RADIATOR FAN.
1) Turn the A/C switch to OFF.
2) Warm the engine until coolant temperature
is over 95°C (203°F).
3 CHECK OPERATION OF RADIATOR FAN.
Turn the A/C switch to ON, set temperature at
the lowest position.
4 CHECK POWER SUPPLY TO MAIN FAN
MOTOR.
CAUTION:
Be careful not to overheat engine during
repair.
1) Turn ignition switch to OFF.
2) Disconnect connector from main fan motor.
3) Start the engine, keep coolant temperature
below 94°C (201°F).
4) Turn the A/C switch to ON, set temperature
at the lowest position.
5) Measure voltage while A/C compressor is
rotating.
6) Measure voltage between main fan motor
connector and chassis ground.
Connector & terminal
(F17) No. 2 (+) — Chassis ground (−):
5 CHECK GROUND CIRCUIT OF MAIN FAN
MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan
motor connector and chassis ground.
Connector & terminal
(F17) No. 4 — Chassis ground:
6 CHECK POOR CONTACT.
Check poor contact in main fan motor con-
nector.
7 CHECK MAIN FAN MOTOR.
Connect battery positive (+) terminal to termi-
nal No. 2 and negative (−) terminal to terminal
No. 4 of main fan motor connector.

RADIATOR MAIN FAN SYSTEM

S146732A10
Step
(1) Coolant temperature 94°C (201°F) or less.
(2) A/C switch set to ON and A/C temperature
at the lowest position.
¼ Radiator main fan does not rotate in high speed
under the following conditions:
(1) Coolant temperature 95°C (203°F) or more.
(2) A/C switch set to ON and A/C temperature
at the lowest position.
Check
When A/C compressor is
operating, does the radiator
main fan rotate in middle
speed?
When A/C compressor is
operating, does the radiator
main fan rotate in low
speed?
When A/C compressor is
operating, does the radiator
main fan rotate in high
speed?
Is the voltage more than 10
V?
Is the resistance less than
5 Ω?
Is there poor contact in
main fan motor connector?
Does the main fan rotate?
CO(H6)-7
Yes
Go to step 2. Go to step 4.
Go to step 3. Go to step 18.
Radiator main fan Go to step 31.
system is okay.
Go to step 5. Go to step 8.
Go to step 6. Repair open cir-
cuit in harness
between main fan
motor connector
and chassis
ground.
Repair poor con- Go to step 7.
tact in main fan
motor connector.
Repair poor con- Replace main fan
tact in main fan motor with a new
motor connector. one.
Cooling
No