Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service 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-
STI model
<Ref. to CO(STI)-8, INSPECTION, Radiator
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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-
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-
Coolant capacity (fill up to “FULL” level):
Refer to “SPC” section. <Ref. to SPC-4, CA-
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.
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-
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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