Opel Frontera UBS. Manual - part 2227

6B–4

ENGINE COOLING

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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

6B–6

ENGINE COOLING

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.

ENGINE COOLING

6B–7

Water Pump

Water Pump and Associated Parts

014R200005

Legend

(1) Timing Belt
(2) Idle Pulley

(3) Water Pump Assembly
(4) Gasket

Removal

1. Disconnect battery ground cable.
2. Drain coolant.
3. Radiator hose (on inlet pipe side).
4. Remove timing belt. Refer to “Timing Belt” in this

manual.

5. Remove Idle pulley.
6. Remove water pump assembly.
7. Remove gasket.

Inspection

Make necessary repair and parts replacement if extreme
wear or damage is found during inspection. Should any of
the following problems occur, the entire water pump
assembly must be replaced:

D

Crack in the water pump body

D

EC leakage from the seal unit

D

Play or abnormal noise in the bearing

D

Cracks or corrosion in the impeller.

Installation

1. Install gasket, clean the mating surface of gasket

before installation.

2. Install water pump assembly and tighten bolts to the

specified torque.

Torque: 25 N·m (2.5 kg·m/18 lb ft)

D

Tightening order
The tightening order are in the illustrate.

NOTE: To prevent the oil leakage, apply the LOCTITE
262 or an equivalent, to the arrow marked fixing bolt
thread.

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