Subaru Legacy IV (2008 year). Manual - part 22

PM-28

Cooling System

PERIODIC MAINTENANCE SERVICES

• 3.0 L model

3) Start the engine, and then check it does not
overheat or it is cooled excessively. If it overheats
or it is cooled excessively, check the cooling sys-
tem.

CAUTION:
If the engine coolant is spilt over exhaust pipe,
wipe it off with cloth to avoid emitting smoke or
causing a fire.
• 2.5 L non-turbo model
<Ref. to CO(H4SO)-15, Water Pump.> <Ref. to
CO(H4SO)-17, Thermostat.> <Ref. to CO(H4SO)-
19, Radiator.> <Ref. to CO(H4SO)-23, Radiator
Cap.>
• 2.5 L turbo model
<Ref. to CO(H4DOTC)-16, Water Pump.> <Ref. to
CO(H4DOTC)-18, Thermostat.> 
<Ref. to CO(H4DOTC)-20, Radiator.> <Ref. to
CO(H4DOTC)-24, Radiator Cap.>
• 3.0 L model
<Ref. to CO(H6DO)-12, Water Pump.> <Ref. to
CO(H6DO)-13, Thermostat.> <Ref. to CO(H6DO)-
15, Radiator.> <Ref. to CO(H6DO)-18, Radiator
Cap.>
4) Check the radiator fan operates using Subaru
Select Monitor, when the coolant temperature ex-
ceeds 96°C (205°F). If it does not operate, check
the radiator fan system.
• 2.5 L non-turbo model
<Ref. to CO(H4SO)-8, INSPECTION, Radiator Fan
System.>
• 2.5 L turbo model
<Ref. to CO(H4DOTC)-9, INSPECTION, Radiator
Fan System.>
• 3.0 L model
<Ref. to CO(H6DO)-8, INSPECTION, Radiator Fan
System.>

(A) Check points for deformation

(B) Check points for deformation, damage, rust

(B)

(A)

PM-00369

PM-29

Engine Coolant

PERIODIC MAINTENANCE SERVICES

11.Engine Coolant

A: REPLACEMENT

WARNING:
The radiator is of the pressurized type. Do not
attempt to open the radiator cap immediately
after the engine has been stopped.

CAUTION:
If the engine coolant is spilt over exhaust pipe,
wipe it off with cloth to avoid emitting smoke or
causing a fire.
1) Lift up the vehicle.
2) Remove the under cover.
3) Place a container under drain pipe.
4) Remove the drain plug to drain engine coolant
into container.

5) For quick draining, open the radiator cap.

NOTE:
• For turbo model, 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 (part No. 
SOA635071)

9) Pour the engine coolant into the radiator (or the
coolant filler tank on turbo models) 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):

2.5 L non-turbo model

MT model

Approx. 6.4 

2

 (6.8 US qt, 5.61 Imp qt)

AT model

Approx. 6.3 

2

 (6.7 US qt, 5.5 Imp qt)

2.5 L turbo model

MT model

Approx. 7.3 

2

 (7.7 US qt, 6.4 Imp qt)

AT model

Approx. 7.2 

2

 (7.6 US qt, 6.3 Imp qt)

3.0 L model

Approx. 7.2 

2

 (7.6 US qt, 6.3 Imp qt)

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 radiator cap (or the coolant filler tank
cap on turbo models), and start the engine. Race 5
to 6 times at 3,000 rpm or less, then stop the en-
gine. (Complete this operation within 40 seconds.)
12) Wait for one minute after the engine stops, then
open the radiator cap (or the coolant filler tank cap
on turbo models). If the engine coolant level drops,
add engine coolant into the radiator (or the coolant
filler tank on turbo models) up to the filler neck po-
sition.
13) Perform the procedures 11) and 12) again.
14) Install the radiator cap (or the coolant filler tank
cap on turbo models) and reservoir tank cap prop-
erly.
15) Start the engine and operate the heater at max-
imum hot position and the blower speed setting to
LO.
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 harden 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.

CO-00248

PM-30

Engine Coolant

PERIODIC MAINTENANCE SERVICES

18) Open the radiator cap (or the coolant filler tank
cap on turbo models). 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 radiator cap (or the coolant filler tank
cap on turbo models) and reservoir tank cap prop-
erly.
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).

B: ADJUSTMENT

1. PROCEDURE TO ADJUST THE CONCENTRATION OF THE SUBARU SUPER COOLANT

CAUTION:
Use the SUBARU Super Coolant with a 50 — 60% concentration in order to obtain maximum anti-
freeze and anti-rust performance.
To adjust the concentration of SUBARU Super Coolant according to temperature, find the proper coolant
concentration from the table, and adjust the concentration of the coolant (concentrated type) with a dilution
water to the proper value.

Recommended engine coolant and dilution water:

Refer to RM section for the recommended engine coolant and diluting water. <Ref. to RM-4, COOL-
ANT, RECOMMENDED MATERIALS, Recommended Materials.>

Relationship of SUBARU Super Coolant concentration and freezing temperature

SUBARU Super Coolant concentration

50%

55%

60%

Freezing temperature

–36°C (–33°F)

–41°C (–42°F)

–50°C (–58°F)

PM-31

Clutch System

PERIODIC MAINTENANCE SERVICES

12.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.
• 5MT model (non-turbo model)

• 5MT model (turbo model)

• 6MT model

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-32, 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 spilt on the exhaust pipe,
wipe it off with a cloth to avoid emitting smoke
or causing a fire.

NOTE:
• 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) Release lever

(B) Push rod

(C) Operating cylinder

(A) Release lever

(B) Push rod

(C) Operating cylinder

PM-00164

(C)

(B) (A)

PM-00499

(C)

(A)

(B)

(A)

(B)

(C)

PM-00322

(A) Reservoir tank

(B) MIN. level

(C) MAX. level

(A)

(C)

(B)

PM-00165