Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 188

CO(w/o STI)-21

Radiator

COOLING

10) Connect the connector (A) to the main fan mo-

tor and the connector (B) to the sub fan motor.

11) Install the under cover. <Ref. to EI-28, INSTAL-

LATION, Front Under Cover.>

12) Lower the vehicle.

13) Connect the battery ground terminal.

14) Fill engine coolant. <Ref. to CO(w/o STI)-13,

FILLING OF ENGINE COOLANT, REPLACE-

MENT, Engine Coolant.>

C: INSPECTION

1) Check that the radiator does not have deforma-

tion, cracks or damage.

2) Check that the hose has no cracks, damage or

loose part.

3) Remove the coolant filler tank cap, fill the cool-

ant filler tank with engine coolant, then install the

radiator cap tester to the filler neck of coolant filler

tank.

4) Apply a pressure of 122 kPa (1.2 kg/cm

2

, 18 psi)

to the radiator and check the following points:

• Leakage from the radiator or its vicinity

• Leakage from the hose or its connections
CAUTION:

• Inspection must be carried out at the side of

coolant filler tank, not at the side of radiator.

• Engine should be turned off.

• Wipe engine coolant from check points in ad-

vance.

• Be careful not to deform the filler neck of the

coolant filler tank when installing and removing

the radiator cap tester.

• Be careful of engine coolant from spurting

out when removing the radiator cap tester.

(A)

CO-02727

(B)

CO-02728

IN-00203

CO-02244

CO(w/o STI)-22

Radiator Cap

COOLING

7. Radiator Cap

A: INSPECTION

1) Check that the radiator cap does not have defor-

mation, cracks or damage.

2) Attach the radiator cap tester to radiator cap.

3) Increase pressure until the radiator cap tester

gauge needle stops. Radiator cap is functioning

properly if it holds the service limit pressure for 5 —

6 seconds. Replace the radiator cap if its valve

opens at less than the service limit.
Coolant filler tank side:

Standard

93 — 123 kPa (0.95 — 1.25 kg/cm

2

, 14 — 18

psi)

Limit

83 kPa (0.85 kg/cm

2

, 12 psi)

Radiator side:

Standard

122 — 152 kPa (1.24 — 1.55 kg/cm

2

, 18 —

22 psi)

Limit

112 kPa (1.14 kg/cm

2

, 16 psi)

CAUTION:

• Be sure to remove foreign matter and rust

from the cap in advance. Otherwise, results of

pressure test will be incorrect.

• Do not confuse the cap of coolant filler tank

and cap of radiator.

CO-00044

CO(w/o STI)-23

Radiator Main Fan and Fan Motor

COOLING

8. Radiator Main Fan and Fan

Motor

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Lift up the vehicle.

3) Remove the under cover. <Ref. to EI-28, RE-

MOVAL, Front Under Cover.>

4) Disconnect the connector from the main fan mo-

tor.

5) Lower the vehicle.

6) Remove the air intake duct. <Ref. to IN(w/o STI)-

10, REMOVAL, Air Intake Duct.>

7) Remove the reservoir tank. <Ref. to CO(w/o

STI)-27, REMOVAL, Reservoir Tank.>

8) Remove the bolts which secure the radiator

main fan motor assembly and the over flow pipe.

9) Remove the radiator main fan motor assembly

from the upper side of the vehicle.

B: INSTALLATION

Install in the reverse order of removal.
CAUTION:

Check if the radiator hose and the over flow

hose are properly connected.
Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

C: DISASSEMBLY

1) Remove the clip which holds the main fan motor

connector onto the radiator main fan shroud.

2) Disconnect the radiator main fan from the main

fan motor.

3) Disconnect the main fan motor from the radiator

main fan shroud.

IN-00203

CO-02776

CO-02511

CO-02372

CO-02373

CO(w/o STI)-24

Radiator Main Fan and Fan Motor

COOLING

D: ASSEMBLY

Assemble in the reverse order of disassembly.
Tightening torque:

4.41 N·m (0.45 kgf-m, 3.25 ft-lb)

Tightening torque:

3.4 N·m (0.3 kgf-m, 2.5 ft-lb)

E: INSPECTION

Check that the radiator main fan, radiator main fan

shroud and main fan motor do not have deforma-

tion, cracks or damage.

CO-02373

CO-02372