cooling SUBARU IMPREZA 2007 3.G User Guide

Maintenance schedule....................................... 11-3
Maintenance precautions ................................... 11-3
Before checking or servicing in the engine compartment .................................................... 11-4
When you do checking or servicing in the engine compartment while the engine is running .......... 11-4
Engine hood ....................................................... 11-4
Engine compartment overview .......................... 11-6
Non-turbo models .............................................. 11-6
Turbo models ..................................................... 11-7
Engine oil ............................................................ 11-8
Checking the oil level ......................................... 11-8
Changing the oil and oil filter .............................. 11-9
Recommended grade and viscosity .................. 11-11
Recommended grade and viscosity under severe driving conditions .......................................... 11-12
Synthetic oil ..................................................... 11-12
Cooling system ................................................ 11-12
Cooling fan, hose and connections ................... 11-12
Engine coolant ................................................. 11-13
Air cleaner element .......................................... 11-15
Replacing the air cleaner element ..................... 11-15
Spark plugs ...................................................... 11-17
Recommended spark plugs .............................. 11-18
Drive belts ........................................................ 11-18
Manual transmission oil .................................. 11-19
Checking the oil level ....................................... 11-19
Recommended grade and viscosity .................. 11-20
Automatic transmission fluid .......................... 11-20
Checking the fluid level .................................... 11-20 Recommended fluid
......................................... 11-21
Front differential gear oil (AT vehicles) .......... 11-21
Checking the oil level ...................................... 11-21
Recommended grade and viscosity .................. 11-22
Rear differential gear oil .................................. 11-22
Checking the gear oil level ............................... 11-22
Recommended grade and viscosity .................. 11-23
Power steering fluid ........................................ 11-24
Checking the fluid level .................................... 11-24
Recommended fluid ......................................... 11-25
Brake fluid ........................................................ 11-25
Checking the fluid level .................................... 11-25
Recommended brake fluid ............................... 11-26
Clutch fluid (MT vehicles) ............................... 11-26
Checking the fluid level .................................... 11-26
Recommended clutch fluid ............................... 11-27
Brake booster .................................................. 11-27
Brake pedal ...................................................... 11-27
Checking the brake pedal free play .................. 11-27
Checking the brake pedal reserve distance....... 11-28
Clutch pedal (MT vehicles) .............................. 11-28
Checking the clutch function ............................ 11-28
Checking the clutch pedal free play .................. 11-28
Replacement of brake pad and lining ............ 11-29
Breaking-in of new brake pads and linings ....... 11-29
Parking brake stroke ....................................... 11-30
Tires and wheels .............................................. 11-30
Types of tires ................................................... 11-30
Tire inspection ................................................. 11-30
Tire pressures and wear .................................. 11-31
Maintenance and service
11

11-4Maintenance and service
guard against getting oil or fluids
in your eyes. If something does
get in your eyes, thoroughly
wash them out with clean water.
. Do not tamper with the wiring of
the SRS airbag system or seat-
belt pretensioner system, or at-
tempt to take its connectors
apart, as that may activate the
system or it can render it inop-
erative. The wiring and connec-
tors of these systems are yellow
for easy identification. NEVER
use a circuit tester for thesewiring.
If your SRS airbag or seatbelt
pretensioner needs service, con-
sult your nearest SUBARU deal-
er.
& Before checking or servicing
in the engine compartment
WARNING
. Always stop the engine and set
the parking brake firmly to pre-
vent the vehicle from moving.
. Always let the engine cool down.
Engine parts become very hot
when the engine is running and remain hot for some time after
the engine is stopped.
. Do not spill engine oil, engine
coolant, brake fluid or any other
fluid on hot engine components.
This may cause a fire.
. Always remove the key from the
ignition switch. When the ignition
switch is in the “ON ”position,
thecoolingfanmayoperate
suddenly even when the engine
is stopped.
& When you do checking or
servicing in the engine com-
partment while the engine isrunning
WARNING
A running engine can be dangerous.
Keep your fingers, hands, clothing,
hair and tools away from the cooling
fan, belts and any other moving
engine parts. Removing rings,
watches and ties is advisable. Engine hood
To open the hood:
1. If the wiper blades are lifted off the
windshield, return them to their originalpositions.
2. Pull the hood release knob under the
instrument panel.

11-12Maintenance and service
&Recommended grade and
viscosity under severe driv-
ing conditions
If the vehicle is used in desert areas, in
areas with very high temperatures, or
used for heavy-duty applications such as
towing a trailer, use of oil with the following
grade and viscosities is recommended.
API classification SM (or SL): SAE viscosity No.: 30, 40, 10W-50,
20W-40, 20W-50
& Synthetic oil
You can use synthetic engine oil that
meets the same requirements given for
conventional engine oil. When using
synthetic oil, you must use oil of the same
classification, viscosity and grade shown
in this Owner ’s Manual, and must follow
the oil and filter changing intervals shown
in the maintenance schedule. Cooling system
WARNING
Never attempt to remove the radia-
tor cap until the engine has been
shut off and has cooled down
completely. Since the coolant is
under pressure, you may suffer
serious burns from a spray of boil-
ing hot coolant when the cap isremoved.
CAUTION
. The cooling system has been
filled at the factory with a high
quality, corrosi on-inhibiting,
year-around coolant which pro-
vides protection against freezing
down to 33 8F( 36 8C). For add-
ing, use genuine SUBARU cool-
ant or an equivalent: a mixture of
50% soft water (or clear and
drinkable water) and 50% phos-
phate or non-amine type coolant.
Use of improper coolants may
result in corrosion in the cooling
system. It is important to main-
tain protection against freezing
and corrosion, even if freezing temperatures are not expected.
Never mix different kinds of cool-ant.
. Do not splash the engine coolant
over painted parts. The alcohol
contained in the engine coolant
may damage the paint surface.
& Cooling fan, hose and con- nections
Your vehicle employs an electric cooling
fan which is thermostatically controlled to
operate when the engine coolant reaches
a specific temperature.
If the radiator cooling fan does not operate
even when the engine coolant tempera-
ture gauge exceeds the normal operating
range, the cooling fan circuit may be
defective. Check the fuse and replace it
if necessary. If the fuse is not blown, have
the cooling system checked by your
SUBARU dealer.
If frequent addition of coolant is neces-
sary, there may be a leak in the engine
cooling system. It is recommended that
the cooling system and connections be
checked for leaks, damage, or looseness.

&Engine coolant
! Checking the coolant level
1) “FULL ”level mark
2) “LOW ”level mark
Check the coolant level at each fuel stop.
1. Check the coolant level on the outside
of the reservoir while the engine is cool.
2. If the level is close to or lower than the “ LOW ”level mark, add coolant up to the
“ FULL ”level mark. If the reserve tank is
empty, remove the radiator cap and refill
as required.
3. After refilling the reserve tank and the
radiator, reinstall the caps and check that
the rubber gaskets inside the radiator cap
are in the proper position.
CAUTION
. Be careful not to spill engine
coolant when adding it. If coolant
touches the exhaust pipe, it may
cause a bad smell, smoke, and/or
a fire. If engine coolant gets on
the exhaust pipe, be sure to wipe
it off.
. Do not splash the engine coolant
over painted parts. The alcohol
contained in the engine coolant
may damage the paint surface. !
Changing the coolant
WARNING
Never attempt to remove the radia-
tor cap until the engine has been
shut off and has cooled down
completely. Since the coolant is
under pressure, you may suffer
serious burns from a spray of boil-
ing hot coolant when the cap isremoved.
Always add genuine Subaru cooling sys-
tem conditioner whenever the coolant isreplaced.
Change the engine coolant and add
genuine Subaru cooling system condi-
tioner using the following procedures Maintenance and service
11-13
– CONTINUED –

11-14Maintenance and service
according to the maintenance schedule.
1. Remove the under cover.
2. Place a proper container under the
drain plug and loosen the drain plug.
3. Loosen the radiator cap to drain the
coolant from the radiator. Then drain the
coolant from the reserve tank. Tighten the
drain plug securely.
NOTE (Turbo model only)
The cap (without tabs) on top of the
radiator does not need to be removed.
To add coolant, remove the cap (with
tabs) on the coolant tank on top of theengine.
4. Install the under cover.
Non-turbo models
1) Filler neck
2) Fill up to this level
Turbo models
1) Filler neck
2) Fill up to this level
5. Slowly pour the coolant and fill up to
just below the filler neck, allowing enough
room to add genuine Subaru cooling
system conditioner in the radiator. Add
genuine Subaru cooling system condi-
tioner until the coolant level reaches the
filler neck. Do not pour the coolant too
quickly, as this may lead to insufficient air
bleeding and trapped air in the system. Guideline of coolant quantity (including
coolant in reservoir tank):
Non-turbo models:MT: 7.4 US qt (7.0 liters, 6.2 Imp qt)
AT: 7.3 US qt (6.9 liters, 6.1 Imp qt)
Turbo models: MT: 8.1 US qt (7.7 liters, 6.8 Imp qt)
AT: 8.0 US qt (7.6 liters, 6.7 Imp qt)
1) “FULL ”level mark
2) “LOW ”level mark
CAUTION
. Be careful not to spill engine
coolant when adding it. If coolant
touches the exhaust pipe, it may
cause a bad smell, smoke, and/or

12-8Specifications
&Fuse panel located in the engine compartment
A) FWD socket (AT models except Turbo)
B) Main fuse
C) Engine sensor (Non-turbo models) Fuse
panel Fuse
rating Circuit
1 20A .Radiator cooling fan
(Main)
2 20A .Radiator cooling fan
(Sub)
3 30A .ABS motor
4 20A .Rear window defogger
5 15A .Hazard warning flasher
. Horn
6 15A .Turn signal lights
7 10A .Automatic transmission
control unit
8 10A .Alternator
9 15A .Headlight (right side)
10 15A .Headlight (left side)
11 20A .Lighting switch
12 20A .Clock
. Interior light
13 10A .Secondary air combina-
tion valve (Turbo models only)

CenterConsole .................................................................. 6-4
Ventilators ............................................................... 4-3
Center and side ventilators ............................................ 4-3
Changing Flat tire ................................................................... 9-4
Oil and oil filter ...................................................... 11-9
Charge warning light .................................................. 3-16
CHECK ENGINE warning light/Malfunction indicator lamp ...................................................................... 3-16
Checking Brake pedal free play ............................................ 11-27
Brake pedal reserve distance ................................. 11-28
Clutch function ...................................................... 11-28
Clutch pedal free play ............................................ 11-28
Engine oil level ...................................................... 11-8
Fluid level ............................... 11-20, 11-24, 11-25, 11-26
Gear oil level ........................................................ 11-22
Child restraint systems ............................................... 1-22
Installation with A/ELR seatbelt ................................ 1-25
Lower and tether anchorages .................................. 1-29
Child safety .................................................................... 5
Locks ................................................................... 2-18
Chime Key ........................................................................ 3-5 Seatbelt ........................................................ 1-11, 3-14
Cleaning
Aluminum wheels ................................................... 10-3
Interior .................................................................. 10-5
Ventilation grille ..................................................... 4-11 Climate control system
Automatic ............................................................... 4-8
Manual ................................................................... 4-3
Clock ........................................................................ 3-22
Clutch Fluid ................................................................... 11-26
Pedal .................................................................. 11-28
Coat hook. .................................................................. 6-9
Coin tray .................................................................... 6-4
Cooling system ........................................................ 11-12
Corrosion protection ............................................ 8-10, 10-4
Cruise control ............................................................ 7-26
Set indicator light .................................................... 3-20
Cruise control indicator light ......................................... 3-20
Cup holder ................................................................. 6-5
Front passenger ’s.................................................... 6-5
Rear passenger ’s .................................................... 6-6
D
Daytime running light system ....................................... 3-23
Differential gear oil
Front ................................................................... 11-21
Rear ................................................................... 11-22
Dimensions ................................................................ 12-2
Disarming the system ................................................. 2-15
Disc brake pad wear warning indicators ........................ 7-21
Dome light .................................................................. 6-2
Door
Locks ..................................................................... 2-4
Open warning light. ................................................. 3-19
Drive belts ............................................................... 11-18 Index
14-3