Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 99
CO(STI)-28
Coolant Filler Tank
COOLING
11.Coolant Filler Tank
A: REMOVAL
CAUTION:
The coolant filler tank is pressurized when the
engine and radiator are hot. Wait until engine
and radiator cool down before working on the
coolant filler tank.
1) Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt)
of coolant. <Ref. to CO(STI)-13, DRAINING OF
ENGINE COOLANT, REPLACEMENT, Engine
2) Disconnect the engine coolant hoses from cool-
ant filler tank.
3) Remove the bolt and nut which secure the cool-
ant filler tank.
4) Remove the coolant filler tank.
B: INSTALLATION
1) Install in the reverse order of removal.
Tightening torque:
16 N·m (1.6 kgf-m, 11.8 ft-lb)
C: INSPECTION
1) Check that the coolant filler tank does not have
deformation, cracks or damage.
2) Check that the engine coolant hose has no
cracks, damage or loose part.
CO-02923
CO(STI)-29
Engine Cooling System Trouble in General
COOLING
12.Engine Cooling System Trouble in General
A: INSPECTION
Trouble
Possible cause
Corrective action
Over-heating
a. Insufficient engine coolant
Replenish engine coolant, inspect for leakage, and
repair it if necessary.
b. Loose timing belt
Repair or replace timing belt tensioner.
c. Oil on timing belt
Replace.
d. Malfunction of thermostat
Replace.
e. Malfunction of water pump
Replace.
f. Clogged engine coolant passage
Clean.
g. Improper ignition timing
h. Clogged or leaking radiator
Clean, repair or replace.
i. Defective radiator fan
Replace.
j. Improper engine oil in engine coolant
Replace the engine coolant. If ineffective, check,
repair or replace engine components.
k. Air/fuel mixture ratio too lean
l. Excessive back pressure in exhaust system
Clean or replace.
m. Insufficient clearance between piston and cylinder
Adjust or replace.
n. Slipping clutch
Repair or replace.
o. Dragging brake
Adjust.
p. Defective radiator fan
Inspect the radiator fan relay, engine coolant temper-
ature sensor or fan motor and replace them.
Over-cooling
a. Ambient temperature extremely low
Partly cover radiator front area.
b. Defective thermostat
Replace.
Engine coolant
leaks
a. Loosened or damaged connecting units on hoses
Repair or replace.
b. Leakage from water pump
Replace.
c. Leakage from water pipe
Repair or replace.
d. Leakage around cylinder head gasket
Retighten cylinder head bolts or replace cylinder
head gasket.
e. Damaged or cracked cylinder head and cylinder block Repair or replace.
f. Damaged or cracked thermostat cover
Repair or replace.
g. Leakage from radiator
Repair or replace.
Noise
a. Timing belt problem
Replace.
b. Defective radiator fan
Replace.
c. Defective water pump bearing
Replace water pump.
d. Defective water pump mechanical seal
Replace water pump.
CO(STI)-30
Engine Cooling System Trouble in General
COOLING
LUBRICATION
LU(STI)
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Oil Pressure System . . . . . . . . . . . . . . . . . . . . ..9
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . .11
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . ..13
Oil Pan and Strainer . . . . . . . . . . . . . . . . . . . . .18
Oil Pressure Switch . . . . . . . . . . . . . . . . . . . . ..22
Engine Oil Cooler . . . . . . . . . . . . . . . . . . . . . .24
Oil Pipe . . . . . . . . . . . . . . . . . . . . . . . . . .25
Engine Oil Filter . . . . . . . . . . . . . . . . . . . . . . 31
Engine Lubrication System Trouble in General . . . . . . . . . . 32
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