2003 SUBARU IMPREZA WRX air condition

11
11-1
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Maintenance schedule 11-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance precautions 11-3 . . . . . . . . . . . . . . . . . . . . . . . .
Engine hood 11-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine compartment overview 11-8 . . . . . . . . . . . . . . . . .
2.5 liter model 11-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.0 liter (Turbo) model 11-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine oil 11-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the oil level 11-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing the oil and oil filter 11-11 . . . . . . . . . . . . . . . . . . .
Recommended grade and viscosity 11-13 . . . . . . . . . . .
Recommended grade and viscosity under
severe driving conditions 11-15 . . . . . . . . . . . . . . . . . . . . . .
Synthetic oil 11-15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling system 11-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling fan, hose and connections 11-16 . . . . . . . . . . . .
Engine coolant 11-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air cleaner element 11-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the air cleaner element 11-20 . . . . . . . . . . . . . .
Spark plugs 11-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended spark plugs 11-24 . . . . . . . . . . . . . . . . . . . . .
Drive belts 11-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual transmission oil 11-25 . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the oil level 11-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended grade and viscosity 11-26 . . . . . . . . . . .
Automatic transmission fluid 11-27 . . . . . . . . . . . . . . . . . . .
Checking the fluid level 11-27 . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended fluid 11-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front differential gear oil (AT vehicles) 11-29
. . . . .
Checking the oil level 11-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended grade and viscosity 11-30 . . . . . . . . . . .
Rear differential gear oil 11-31 . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the gear oil level 11-31 . . . . . . . . . . . . . . . . . . . . . . .
Recommended grade and viscosity 11-32 . . . . . . . . . . .
Power steering fluid 11-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the fluid level 11-32 . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended fluid 11-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake fluid 11-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the fluid level 11-34 . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended brake fluid 11-34 . . . . . . . . . . . . . . . . . . . . . . .
Clutch fluid (MT vehicles) 11-35 . . . . . . . . . . . . . . . . . . . . . . . .
Checking the fluid level 11-35 . . . . . . . . . . . . . . . . . . . . . . . . . .
Recommended clutch fluid 11-36 . . . . . . . . . . . . . . . . . . . . . .
Brake booster 11-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake pedal 11-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the brake pedal free play 11-37 . . . . . . . . . . . .
Checking the brake pedal reserve distance 11-37 . .
Clutch pedal (MT vehicles) 11-38 . . . . . . . . . . . . . . . . . . . . . .
Checking the clutch function 11-38 . . . . . . . . . . . . . . . . . . . .
Checking the clutch pedal free play 11-38 . . . . . . . . . . .
Replacement of brake pad and lining 11-39 . . . . . . . .
Breaking-in of new brake pads and linings 11-39 . . .
Parking brake stroke 11-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires and wheels 11-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types of tires 11-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and service

Maintenance and service
11-20
this time, make sure that the rubber gasket in the ra-
diator cap is correctly in place.
8. Start and run the engine for more than five min-utes at 2,000 to 3,000 rpm.
9. Stop the engine and wait until the coolant coolsdown (122 to 140°F [50 to 60 °C]). If there is any loss
of coolant, add coolant to the radiator ’s filler neck
and to the reserve tank ’s “FULL” level.
10. Put the radiator cap and reservoir cap back on
and tighten firmly. Air cleaner element
The air cleaner element functions as a filter screen.
When the element is perforated or removed, engine
wear will be excessive and engine life shortened.
The air cleaner element is a viscous type. It is un-
necessary to clean or wash the element.
WARNING
Do not operate the engine with the air cleaner
element removed. The air cleaner element notonly filters intake air but also stops flames ifthe engine backfires. If the air cleaner elementis not installed when the engine backfires, youcould be burned.
Replacing the air cleaner element
Non-turbo models
Replace the air cleaner element according to the
maintenance schedule in the “Warranty and Mainte-
nance Booklet ”. Under extremely dusty conditions,
replace it more frequently. It is recommended that
you always use genuine SUBARU parts.

Maintenance and service
11-24
CAUTION
When disconnecting the spark plug cables,
always grasp the spark plug cap, not the cables. Make sure the cables are replaced in the
correct order.
Recommended spark plugs
Non-turbo models: RC10YC4 (Champion) BKR6E-11 (NGK)
BKR5E-11 (NGK)
Turbo models: PFR6G (NGK)
Drive belts
1) Power steering pump pulley
2) Air conditioner compressor pulley
3) Crank pulley
The alternator, power steering pump, and air condi-
tioner compressor depend on drive belts. Satisfacto-
ry performance requires that belt tension be correct.
To check belt tension, place a straightedge (ruler)
across two adjacent pulleys and apply a force of 22 lb (98 N, 10 kg) midway between the pulleys by us- ing a spring scale. Belt deflection should be the
amount specified. If a belt is loose, cracked, or

Maintenance and service
11-39
– CONTINUED –
Replacement of brake pad and lining
The front disc brakes and the right rear disc brake have an audible wear indicators on the brake pads. If the brake pads wear close to their service limit,
the wear indicator makes a very audible scrapingnoise when the brake pedal is applied.
If you hear this scraping noise each time you apply the brake pedal, have the brake pads serviced byyour SUBARU dealer as soon as possible.
CAUTION
If you continue to drive despite the scraping noise from the audible brake pad wear indica-
tor, it will result in the need for costly brake rotor repair or replacement.
Breaking-in of new brake pads and linings
When replacing the brake pad or lining, use only
genuine SUBARU parts. After replacement, the new
parts must be broken in as follows:
Brake pad and lining
While maintaining a speed of 30 to 40 mph (50 to 65
km/h), step on the brake pedal lightly. Repeat this
five or more times.
Parking brake lining
1. Drive the vehicle at a speed of about 22 mph (35km/h).
2. With the parking brake release button pushed in,
pull the parking brake lever SLOWLY and GENTLY.
(Pulling with a force of approximately 33 lb [147 N,15 kg].)
3. Drive the vehicle for about 220 yards (200 me- ters) in this condition.

Specifications
12-7
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Fuse panelFuse ratingCircuit
1210AIllumination bright- ness control
1310ACombination meter
SRS lamp
1410ARear window wiper and washer
1530AWindshield wiper and washer
1620ABrake light
1715AAir conditioner
1815ABackup light
Cruise control
1920AMirror heater
20Empty
21Empty
Fuse panelFuse ratingCircuit
2210A ABS ignition
2320AAccessory power outlet (cargo)
Seat heater

Index
14-2
A
ABS (Anti-lock Brake System) 7-23. . . . . . . . . . . . . . . . .
Warning light 3-13, 7-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessory power outlet 6-8, 6-11 . . . . . . . . . . . . . . . . .
Accessories 5-2, 11-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air cleaner element 11-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air conditioner operation 4-9 . . . . . . . . . . . . . . . . . . . . . .
Air filtration system 4-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air flow selection 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aluminum wheels 11-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ambient temperature indicator 3-9 . . . . . . . . . . . . . . . .
Antenna system 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-lock Brake System (ABS) 7-23 . . . . . . . . . . . . . . . .
Arming the system 2-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest 1-9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ashtray 6-12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT OIL TEMPerature warning light 3-13 . . . . . . . . . . . .
Audio set 5-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-dimming mirror /compass 3-27 . . . . . . . . . . . . . . . .
Automatic/Emergency Locking Retractor
(A/ELR) 1-14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic transmission 7-14 . . . . . . . . . . . . . . . . . . . . . . . .
Capacities 12-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 11-27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Selector lever 7-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift lock release 7-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature warning light 3-13 . . . . . . . . . . . . . . . . . . B
Battery
11-54
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump starting 9-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement (Remote keyless entry system) 2-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Booster 11-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 11-34
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pad and lining 11-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal 11-37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake system 7-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning light 3-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tips 7-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Breaking-in of new brake pads and linings 11-40
Brake pedal
Free play 11-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reserve distance 11-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Chart 12-9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing 11-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CCapacities 12-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cargo Anchorage hooks 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Area light 6-2, 11-73 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .