Opel Frontera UBS. Manual - part 258

6B–2

ENGINE COOLING

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

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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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

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6B–4

ENGINE COOLING

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)

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D

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.

NOTE:

1. Even in the areas where the atmospheric

temperature is higher than 0

°

C, be sure not to use

antifreeze solution at a mixing ratio lower than 20% so
that the inside of the engine may not be corroded.

2. If antifreeze solution is used at a mixing ratio higher

than 60%, the specific heat of the coolant falls and the
engine may be overheated. Moreover, antifreeze
performance drop and the coolant may be frozen.
The density of the solution must be adjusted as
occasion calls.

Antifreeze solution lower than 20% may not have
sufficient anticorrosive performance, and therefore,
please never fail to adjust as occasion demands within
the range of 20% to 60%.

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ENGINE COOLING

6B–5

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