Isuzu Rodeo UE. Manual - part 296

6B–2

ENGINE COOLING (6VD1 3.2L)

General Description

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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.

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ENGINE COOLING (6VD1 3.2L)

6B–3

Thermostat

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

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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)

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Antifreeze Solution

f

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.

f

Calculating mixing ratio

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

f

Total Cooling System Capacity

f

M/T 11.1Lit (2.93Us gal)

f

A/T 10.0Lit (2.64Us gal)

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6B–4

ENGINE COOLING (6VD1 3.2L)

f

Mixing ratio

Check the specific gravity of engine coolant in the
cooling system temperature ranges from 0

°

C to 50

°

C

using a suction type hydrometer, then determine the
density of the engine coolant by referring to the table.

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Diagnosis

Engine Cooling Trouble

Condition

Possible cause

Correction

Engine overheating

Low Engine Coolant level

Replenish

Incorrect fan installed

Replace

Thermo meter unit faulty

Replace

Faulty thermostat

Replace

Faulty Engine Coolant temperature
sensor

Repair or replace

Clogged radiator

Clean or replace

Faulty radiator cap

Replace

Low engine oil level or use of
improper engine oil

Replenish or change oil

Clogged exhaust system

Clean exhaust system or replace
faulty parts

Faulty Throttle Position sensor

Replace throttle valve assembly

Open or shorted Throttle Position
sensor circuit

Repair or replace

Damaged cylinder head gasket

Replace

Engine overcooling

Faulty thermostat

Replace

Engine slow to warm–up

Faulty thermostat

Replace

Thermo unit faulty

Replace

ENGINE COOLING (6VD1 3.2L)

6B–5

Draining and Refilling Cooling
System

Before draining the cooling system, inspect the system
and perform any necessary service to ensure that it is
clean, does not leak and is in proper working order. The
engine coolant (EC) level should be between the “MIN”
and “MAX” lines of reserve tank when the engine is cold.
If low, check for leakage and add EC up to the “MAX” line.
There should not be any excessive deposit of rust or
scales around the radiator cap or radiator filler hole, and
the EC should also be free from oil.
Replace the EC if excessively dirty.

1. Completely drain the cooling system by opening the

drain plug (2) at the bottom of the radiator.

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2. Remove the radiator cap.

WARNING: TO AVOID THE DANGER OF BEING
BURNED, DO NOT REMOVE THE CAP WHILE THE
ENGINE AND RADIATOR ARE STILL HOT.
SCALDING FLUID AND STEAM CAN BE BLOWN OUT
UNDER PRESSURE.

3. Disconnect all hoses from the EC reserve tank.

Scrub and clean the inside of the reserve tank with
soap and water. Flush it well with clean water, then
drain it.  Install the reserve tank and hoses.

4. Refill the cooling system with the EC using a solution

that is at least 50 percent antifreeze but no more than
70 percent antifreeze.

5. Fill the radiator to the base of the filler neck.

Fill the EC reserve tank to “MAX” line when the engine
is cold.

6. Block the drive wheels and firmly apply the parking

brake. Shift an automatic transmission to “P” (Park)
or a manual transmission to neutral.

7. Remove the radiator cap. Start the engine and warm

it up at 2,500 

∼

 3,000 rpm for about 30 minutes.

8. When the air comes out from the radiator filler neck

and the EC level has gone down, replenish with the
EC. Repeat this procedure until the EC level does not
go down. Then stop the engine and install the radiator
cap. Let the engine cool down.

9. After the engine has cooled, replenish with EC up to

the “MAX” line of the reserve tank.

10. Start the engine. With the engine running at 3,000

rpm, make sure there is no running water sound from
the heater core (behind the center console).

11. If the running water sound is heard, repeat steps 8 to

10.