Subaru Impreza 2003 Service Manual page 2712

POWER ASSISTED SYSTEM (POWER STEERING)
11.Power Steering Fluid
A: SPECIFICATION
Recommended power steering fluid
DEXRON III or equivalent
B: INSPECTION
1) Check the power steering fluid for deterioration
or contamination. If the fluid is highly deteriorated
or contaminated, drain it and refill with new fluid.
2) Check the joints and units for oil leakage. If any
oil leaks are found, repair or replace the applicable
part.
3) Inspect the fluid level on flat and level surface
with engine "OFF" by indicator of reservoir tank.
If the level is at MIN. point or below, add fluid to
keep the level in the specified range of the indica-
tor. If at MAX. point or above, drain fluid by using a
syringe or the like.
(1) Check at power steering fluid temperature
20°C (68°F); read the fluid level on the "COLD"
side.
(2) Check at power steering fluid temperature
80°C (176°F); read the fluid level on the "HOT"
side.
POWER STEERING FLUID
Manufacturer
B.P.
CALTEX
CASTROL
MOBIL
SHELL
TEXACO
COLD MAX.
HOT MAX.
HOT MIN.
COLD MIN.
PS-00159
PS-88
C: REPLACEMENT
1) Lift up the vehicle.
2) Remove the jack up plate.
3) Remove the pipe joint in center of gear box, and
then install the vinyl hose to pipe and joint. Drain
the fluid while turning steering wheel.
4) Set the ST on top of reservoir tank and fill it
about half way with the specified fluid.
ST 34199AE040 OIL CHARGE
5) Continue to turn the steering wheel slowly from
lock to lock until bubbles stop appearing on oil sur-
face while keeping the fluid at that level.
6) If turning the steering wheel in low fluid level
condition, air will be sucked in pipe. In this case,
leave it about half an hour and then do the step 5)
again.
7) Lift up the vehicle, start the engine and let it idle.
8) Continue to turn the steering wheel slowly from
lock to lock again until bubbles stop appearing on
oil surface while keeping the fluid at that level.
It is normal that bubbles stop appearing after three
times turning of steering wheel from lock to lock.
9) In case the bubbles do not stop appearing in the
tank, leave it about half an hour and then do the
step 4) all over again.
10) Lower the vehicle, and then idle the engine.
11) Continue to turn the steering wheel from lock to
lock until bubbles stop appearing and change of the
fluid level is within 3 mm (0.12 in).
12) In case the following happens, leave it about
half an hour and then do step 8) to 11) again.
(1) The fluid level changes over 3 mm (0.12 in).
(2) Bubbles remain on the upper surface of the
fluid.
(3) Grinding noise is generated from oil pump.
13) Check the fluid leakage after turning steering
wheel from lock to lock with engine running.
PS-00160