Subaru IMPREZA 2002 Service Manual page 258

Trouble Possible cause
a. Insufficient engine coolant
1 I .
f. Clogged engine coolant passage
g. Improper ignition timing
h. Clogged or leaking radiator
i. Improper engine oil in enaine coolant
I
1. Insufficient clearance between piston and cylinder
ENGINE COOLING SYSTEM TROUBLE IN GENERAL
COOLING
13.Engine Cooling System Trouble in General
A: INSPECTION
Corrective action
Replenish engine coolant, inspect for leakage, and
repair.
Repair or replace timing belt tensioner.
Replace.
I
b. Loose timing belt
I
c. Oil on drive belt
Replace. d. Malfunction of thermostat
e. Malfunction of water DumD Replace.
Clean.
Inspect and repair ignition control system.
<Ref. to EN(SOHC)Q, Basic Diagnostic Procedure.>
or
<Ref. to EN(D0HC TURBO)Q, PROCEDURE, Basic
Diagnostic Procedure.>
Clean or repair, or replace.
Replace engine coolant.
Inspect and repair fuel injection system.<Ref. to
EN(SOHC)Q, Basic Diagnostic Procedure.> or <Ref. to
EN(D0HC TURBO)-2, PROCEDURE, Basic Diagnostic
Procedure.>
Clean or replace.
Adjust or replace.
Repair or replace.
Over-heating
j. Aidfuel mixture ratio too lean
k. Excessive back pressure in exhaust system
m. Slipping clutch
n. Dragging brake
0.
Improper transmission oil
P.
Defective thermostat
Adjust.
Replace.
Inspect radiator fan relay, engine coolant temperature
sensor or radiator motor and replace there.
I
q. Malfunction of electric fan
I
a. Atmospheric temperature extremely low Partly cover radiator front area.
3ver-cooling
Replace. b. Defective thermostat
a. Loosened or damaged connecting units on hoses
b. Leakage from water Dump Replace.
Repair or replace.
Retighten cylinder head bolts or redace aasket.
Engine coolant
eaks.
c. Leakage from water pipe
d. Leakage around cylinder head gasket
I
e. Damaged or cracked cylinder head and crankcase Repair or replace.
Repair or replace. f. Damaged or cracked thermostat case
g. Leakage from radiator
a. Defective drive belt
Repair or replace.
Replace.
Replace.
Replace water pump.
Replace water pump.
Uoise
I
b. Defective radiator fan
I
c. Defective water pump bearing
I
d. Defective water pump mechanical seal
CO-52