Subaru Legacy III (2000-2003 year). Service manual — part 81
CO(H4SO)-32
COOLING
RESERVOIR TANK
11.Reservoir Tank
A: REMOVAL
1) Disconnect overflow hose from radiator filler
neck position.
2) Remove bolts which install reservoir tank onto
radiator main fan shroud.
3) Remove reservoir tank.
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
4.9N·m (0.50 kgf-m, 3.6 ft-lb)
C: INSPECTION
Make sure the engine coolant level is between full
and low.
CO-00087
CO-00087
CO(H4SO)-33
COOLING
ENGINE COOLING SYSTEM TROUBLE IN GENERAL
12.Engine Cooling System Trouble in General
A: INSPECTION
Trouble
Corrective action
Over-heating
a. Insufficient engine coolant
Replenish engine coolant, inspect for leakage, and
repair.
b. Loose timing belt
Repair or replace timing belt tensioner.
c. Oil on drive belt
Replace.
d. Malfunction of thermostat
Replace.
e. Malfunction of water pump
Replace.
f. Clogged engine coolant passage
Clean.
g. Improper ignition timing
Inspect and repair ignition control system.
<Ref. to EN(H4SO)-2, ENGINE, PROCEDURE, Basic
Diagnostic Procedure.> or <Ref. to EN(H4SOw/oOBD)-
2, PROCEDURE, Basic Diagnostic Procedure.>
h. Clogged or leaking radiator
Clean or repair, or replace.
i. Engine oil mixed in engine coolant
Replace engine coolant.
j. Air/fuel mixture ratio too lean
Inspect and repair fuel injection system.
<Ref. to EN(H4SO)-2, ENGINE, PROCEDURE, Basic
Diagnostic Procedure.> or <Ref. to EN(H4SOw/oOBD)-
2, PROCEDURE, Basic Diagnostic Procedure.>
k. Excessive back pressure in exhaust system
Clean or replace.
l. Insufficient clearance between piston and cylinder
Adjust or replace.
m. Slipping clutch
Repair or replace.
n. Dragging brake
Adjust.
o. Improper transmission oil
Replace.
p. Malfunction of electric fan
Inspect radiator fan relay, engine coolant temperature
sensor or radiator motor and replace there.
Over-cooling
a. Atmospheric temperature extremely low
Partly cover radiator front area.
b. Malfunction of 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 gasket.
e. Damaged or cracked cylinder head and crankcase Repair or replace.
f. Damaged or cracked thermostat case
Repair or replace.
g. Leakage from radiator
Repair or replace.
Noise
a. Defective drive belt
Replace.
b. Defective radiator fan
Replace.
c. Defective water pump bearing
Replace water pump.
d. Defective water pump mechanical seal
Replace water pump.
CO(H4SO)-34
COOLING
ENGINE COOLING SYSTEM TROUBLE IN GENERAL
MEMO:
LUBRICATION
LU(H4SO)
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Oil Pressure System . . . . . . . . . . . . . . . . . . . . ...6
Engine Oil. . . . . . . . . . . . . . . . . . . . . . . . . 8
Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . ...10
Oil Pan and Strainer . . . . . . . . . . . . . . . . . . . . ..14
Oil Pressure Switch. . . . . . . . . . . . . . . . . . . . ...17
Engine Oil Filter. . . . . . . . . . . . . . . . . . . . . . .18
Engine Lubrication System Trouble in General. . . . . . . . . . .19
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