Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual - part 728

6A–93

ENGINE MECHANICAL

ILLUSTRATION

TOOL NO.

TOOL NAME

J–42686

Lever; Gear spring

J–43041

Holder; Universal

ENGINE COOLING

6B–1

TROOPER

ENGINE

ENGINE COOLING

CONTENTS

Service Precaution

6B–1

. . . . . . . . . . . . . . . . . . . . . . 

General Description

6B–2

. . . . . . . . . . . . . . . . . . . . . 

Diagnosis

6B–5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Draining and Refilling Cooling System

6B–6

. . . . . 

Water Pump

6B–7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Water Pump and Associated Parts

6B–7

. . . . . . . 

Removal

6B–7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection

6B–7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6B–7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Thermostat

6B–8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Thermostat and Associated Parts

6B–8

. . . . . . . . 

Removal

6B–8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection

6B–8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6B–8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Radiator

6B–9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Radiator and Associated Parts

6B–9

. . . . . . . . . . 

Removal

6B–9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection

6B–10

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6B–11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Drive Belt and Cooling Fan

6B–12

. . . . . . . . . . . . . . . 

Drive Belt and Associated Parts

6B–12

. . . . . . . . . 

Inspection

6B–12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

6B–12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Main Data and Specifications

6B–13

. . . . . . . . . . . . . 

Special Tool

6B–14

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS).  REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING. WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION. FAILURE TO
FOLLOW WARNINGS COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.

CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

SECTION

6B–2

ENGINE COOLING

General Description

030RW001

Legend

(1) Water Pump
(2) Thermostat
(3) Radiator
(4) Reserve Tank
(5) Cooling Fan
(6) Cylinder Block

(7) Cylinder Head
(8) Right Bank
(9) Throttle Body

(10) Cylinder Block

(11) Cylinder Head

(12) Left Bank
(13) Heater

The cooling system is a pressurized Engine Coolant (EC)
forced circulation type which consists of a water pump,
thermostat cooling fan, radiator and other components.
The automatic transmission fluid is cooled by the EC in
radiator.

Water Pump

The EC pump is a centrifugal impeller type and is driven
by a timing belt.

030RS001

ENGINE COOLING

6B–3

Thermostat

The thermostat is a wax pellet type with a air hole(1) and is
installed in the thermostat housing.

031RW002

Radiator

The radiator is a tube type with corrugated fins. In order to
raise the boiling point of the coolant, the radiator is fitted
with a cap in which the valve is operated at 88.2 

∼

 117.6

kPa (12.8 

∼

 17.0 psi) pressure. (No oil cooler provided for

M/T)

110RS001

Anti Freeze Solution

D

Relation between the mixing ratio and freezing
temperature of the EC varies with the ratio of
anti–freeze solution in water. Proper mixing ratio can
be determined by referring to the chart. Supplemental
inhibitors or additives claiming to increase cooling
capability that have not been specifically approved by
Isuzu are not recommended for addition to the cooling
system.

D

Calculating mixing ratio

F06RW005

NOTE: Antifreeze solution + Water = Total cooling
system capacity.

D

Total Cooling System Capacity

D

M/T 8.8Lit (2.32Us gal)

D

A/T 8.4Lit (2.22Us gal)