Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 20

PM-18

Cooling System

PERIODIC MAINTENANCE SERVICES

4) Check the radiator fan operates using Subaru

Select Monitor, when the coolant temperature ex-

ceeds the specified value. If it does not operate,

check the radiator fan system. <Ref. to CO(STI)-7,

Radiator Fan System.> <Ref. to CO(w/o STI)-7,

Radiator Fan System.>
Engine coolant temperature:

Except for STI model

<Ref. to CO(w/o STI)-8, INSPECTION, Radia-

tor Fan System.>

STI model

<Ref. to CO(STI)-8, INSPECTION, Radiator

Fan System.>

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PM-19

Engine Coolant

PERIODIC MAINTENANCE SERVICES

12.Engine Coolant

A: INSPECTION

CAUTION:

• Do not use water instead of coolant.

• Refer to “RM” section for the recommended

engine coolant. <Ref. to RM-4, COOLANT, REC-

OMMENDED MATERIALS, Recommended Ma-

terials.>

1) Park the vehicle on a level surface.

2) Make sure the engine coolant level in the reser-

voir tank is between “FULL” and “LOW” when the

engine is cold.
NOTE:

If the engine coolant level drops, make sure that

there are no engine coolant leakage, and add en-

gine coolant to the “FULL” line.

3) Remove the radiator cap and make sure that the

radiator is filled with engine coolant up to the filler

neck position.

B: REPLACEMENT

WARNING:

The radiator is of the pressurized type. Do not

attempt to open the radiator cap immediately

after the engine has been stopped.

1) Lift up the vehicle.

2) Remove the under cover.

3) Place a container under drain pipe.

4) Loosen and remove the drain cock to drain en-

gine coolant into container.

5) For quick draining, open the radiator cap.
CAUTION:

If any engine coolant is spilled on the exhaust

pipe, wipe off completely to prevent fires or

emission of smoke.
NOTE:

• Be sure to open the radiator cap on the filler tank

side.

• Be careful not to spill coolant on the floor.

6) Drain the coolant from reservoir tank.

7) Tighten the radiator drain cock securely after

draining coolant.

8) Pour cooling system conditioner through the fill-

er neck.
Cooling system protective agent:

Cooling system conditioner (SOA345001)

9) Fill the engine coolant into coolant filler tank up

to the filler neck position.

10) Fill engine coolant into the reservoir tank up to

“FULL” level.
Recommended engine coolant:

Refer to “RM” section. <Ref. to RM-4, COOL-

ANT, RECOMMENDED MATERIALS, Recom-

mended Materials.>

Coolant capacity (fill up to “FULL” level):

Refer to “SPC” section. <Ref. to SPC-4, CA-

PACITY, Impreza.>

NOTE:

The SUBARU Super Coolant contains anti-freeze

and anti-rust agents, and is especially made for

Subaru engines with an aluminum cylinder block.

Always use SUBARU Super Coolant since other

engine coolant may cause corrosion.

11) Close the coolant filler tank cap, and start the

engine. Race 5 to 6 times at 3,000 rpm or less, then

stop the engine. (Complete this operation within 40

seconds.)

12) Wait for one minute after the engine stops, then

open the coolant filler tank cap. If the engine cool-

ant level drops, add engine coolant into the coolant

filler tank up to the filler neck position.

13) Perform the procedures 11) and 12) again.

14) Install the coolant filler tank cap and reservoir

tank cap properly.

15) Start the engine and operate the heater at max-

imum hot position and the blower speed setting to

“LO”.

CO-02764

FULL

LOW

CO-02365

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PM-20

Engine Coolant

PERIODIC MAINTENANCE SERVICES

16) Run the engine at 2,000 rpm or less until radia-

tor fan starts and stops.
NOTE:

• Be careful with the engine coolant temperature

gauge to prevent overheating.

• If the radiator hose becomes hardened with the

pressure of engine coolant, air bleeding operation

seems to be almost completed.

17) Stop the engine and wait until the engine cool-

ant temperature lowers to 30°C (86°F) or less.

18) Open the coolant filler tank cap. If the engine

coolant level drops, add engine coolant into the

coolant filler tank up to the filler neck position and

the reservoir tank to “FULL” level.

19) Install the coolant filler tank cap and reservoir

tank cap properly.

20) Set the heater setting to maximum hot position

and the blower speed setting to “LO” and start the

engine. Perform racing at 3,000 rpm or less. If the

flowing sound is heard from heater core, repeat the

procedures from step 16).

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PM-21

Clutch System

PERIODIC MAINTENANCE SERVICES

13.Clutch System

A: INSPECTION AND ADJUSTMENT

1) Push the release lever to retract the push rod of

the operating cylinder and check if the fluid level in

the clutch reservoir tank rises or not.

2) If the fluid level rises, pedal free play is correct.

3) If the fluid level does not rise, or the push rod

cannot be retracted, adjust the clutch pedal. <Ref.

to CL-28, Clutch Pedal.>

4) Check the fluid level using the scale on the out-

side of the clutch reservoir tank (A). If the level is

below “MIN” (B), inspect the clutch master cylinder,

operating cylinder and hydraulic line for fluid leaks.

If fluid leaks are found, repair or replace. If fluid

leaks are not found, add clutch fluid to bring it up to

“MAX” (C) of clutch reservoir tank.
Recommended clutch fluid:

Refer to “RM” section. <Ref. to RM-4, FLUID,

RECOMMENDED MATERIALS, Recommend-

ed Materials.>

CAUTION:

• Prevent the clutch fluid from being splashed

over vehicle body. If clutch fluid is splashed

over vehicle body, flush it, and then wipe it up.

• If any clutch fluid is spilled on the exhaust

pipe, wipe off completely to prevent fires or

emission of smoke.

• Avoid mixing brake fluid of different brands

to prevent fluid performance from degrading.

• Be careful not to allow dirt or dust to get into

the reservoir tank.

(A) Release lever
(B) Push rod

(C) Operating cylinder

(A)

(C)

(B)

PM-00436

(A) Reservoir tank
(B) MIN. level

(C) MAX. level

PM-00422

(A)

(C)

(B)

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