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ENGINE COOLING SYSTEM
[TOOol 2-5
T TROUBLESHOOTING
Trouble
Possible cause
Corrective action
a .
Insufficient coolant.
Replenish coolant, inspect for leakage, and repair .
b .
Loose drive belt.
Adjust drive belt tension.
c .
Oil on drive belt.
Replace.
d .
Malfunction of thermostat .
Replace.
e .
Malfunction of water pump .
Replace.
f.
Clogged coolant passage .
Clean.
g .
Improper ignition timing .
Adjust.
h .
Clogged or leaking radiator .
Clean or repair, or replace.
Over-heating
i .
Improper engine oil .
Replace .
j .
Air-fuel mixture too thin .
Inspect and repair fuel system .
k .
Excessive back pressure in exhaust system .
Clean or replace .
I .
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 .
Defective thermostat.
Replace .
q .
Malfunction of radiator fan .
Inspect radiator fan relay, water temperature sensor or
motor, and replace there.
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a . Atmospheric temperature extremely low .
Party cover radiator front area .
ver-coo ng
b .
Defective thermostat.
Replace .
a .
Loosened or damaged connecting units on hoses .
Repair or replace.
b .
Leakage from water pump .
Replace .
c.
Leakage from intake manifold.
Repair or replace.
Coolant leaks
d .
Leakage around cylinder head gasket.
Retighten cylinder head nuts 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.
a .
Defective drive belt .
Replace .
b .
Defective electric fan.
Replace .
Noise
c .
Defective water pump bearing .
Replace water pump.
d .
Defective water pump mechanical seal .
I Replace water pump.
15
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Table of Contents
Troubleshooting
