Engine Cooling System Trouble In General - Subaru legacy 2003 Service Manual

ENGINE COOLING SYSTEM TROUBLE IN GENERAL

COOLING
13.Engine Cooling System Trouble in General
A: INSPECTION
Trouble
a. Insufficient engine coolant
b. Loose timing belt
c. Oil on drive belt
d. Malfunction of thermostat
e. Malfunction of water pump
f. Clogged engine coolant passage
g. Improper ignition timing
h. Clogged or leaking radiator
Over-heating
i. Engine oil mixed in engine coolant
j. Air/fuel mixture ratio too lean
k. Excessive back pressure in exhaust system
l. Insufficient clearance between piston and cylinder
m. Slipping clutch
n. Dragging brake
o. Improper transmission oil
p. Malfunction of electric fan
a. Atmospheric temperature extremely low
Over-cooling
b. Malfunction of thermostat
a. Loosened or damaged connecting units on hoses
b. Leakage from water pump
c. Leakage from water pipe
Engine coolant
d. Leakage around cylinder head gasket
leaks.
e. Damaged or cracked cylinder head and crankcase Repair or replace.
f. Damaged or cracked thermostat case
g. Leakage from radiator
a. Defective drive belt
b. Defective radiator fan
Noise
c. Defective water pump bearing
d. Defective water pump mechanical seal
Replenish engine coolant, inspect for leakage, and
repair.
Repair or replace timing belt tensioner.
Replace.
Replace.
Replace.
Clean.
Inspect and repair ignition control system.
<Ref. to EN(H4DOSTC)-2, ENGINE, PROCEDURE,
Basic Diagnostic Procedure.>
Clean or repair, or replace.
Replace engine coolant.
Inspect and repair fuel injection system.
<Ref. to EN(H4DOSTC)-2, ENGINE, PROCEDURE,
Basic Diagnostic Procedure.>
Clean or replace.
Adjust or replace.
Repair or replace.
Adjust.
Replace.
Inspect radiator fan relay, engine coolant temperature
sensor or radiator motor and replace there.
Partly cover radiator front area.
Replace.
Repair or replace.
Replace.
Repair or replace.
Retighten cylinder head bolts or replace gasket.
Repair or replace.
Repair or replace.
Replace.
Replace.
Replace water pump.
Replace water pump.
CO(H4DOSTC)-34
Corrective action