Chery A18. Manual — part 3

COOLING SYSTEM

DESCRIPTION OF COOLING SYSTEM

… … . . … . . … . …C-2

COMPONENTS OF 480 ENGINE COOLING SYSTEM … … . . . . C-2

WORKING PRINCIPLE OF COOLING SYSTEM … … . . … . . C-2

PARAMETERS OF COOLING SYSTEM … … . . … . . … . C-3

ENGINE COOLANT … … . . … . . … . . … . . … …C-3

COOLANT DISCHARGE … … . . … . . … . . . . …C-3

COOLING SYSTEM CLEANING … … . . … . . … . … …C-3

COOLANT FILLING … … . . … . . … . . … . . …C-4

COOLING SYSTEM CHECKUP . . . … . … . … . . …C-5

COOLING SYSTEM MAINTENANCE WARNING … … . . … . … …C-5

WARNING … … . . . . . . . . . . … . …C-5

WATER PUMP … … . . … . . … . … … … . . . . …C-6

STRUCTURE … … . . … . . … . . … . . … …C-6

DISASSEMBLY/ASSEMBLY … … . . … . . … . . … …C-6

THERMOSTAT

… … . . … . . … . . … . . … . …C-7

DISASSEMBLY/ASSEMBLY … … . . … . . … . . … …C-7

WATER TEMPERATURE SENSOR … … . . … . . … . . …C-9

DISASSEMBLY/ASSEMBLY … … . . … . . … . . … …C-9

CHECKING … … . . … . . … . . … . . … . C-9

COOLING FAN … … . . … . . … . . … . . … . C-9

DISASSEMBLY/ASSEMBLY … … . . … . . … . . … …C-9

GUIDELINE FOR DISASSEMBLY … … . . … . . … . … …C-10

EXPANSION RESERVOIR

… … . . … . . … . . … . …C-11

DISASSEMBLY/ASSEMBLY … … . . … . . … . . … …C-11

ASSEMBLY OF RADIATOR . . . … . … . … . . … . C-12

DISASSEMBLY/ASSEMBLY … … . . … . . … . . … …C-12

COOLING SYSTEM

DESCRIPTION OF COOLING SYSTEM

COMPONENTS OF 480 ENGINE COOLING SYSTEM

Engine cooling system is used to cool engine to

prevent the engine from overheating, ensuring the
normal operation of engine. It is composed of the
timing belt-driven water pump, transverse radiator,
water tank, water pipe, thermostat, temperature control
switch of electrically-driven fan and water temperature
sensor.

WORKING PRINCIPLE OF COOLING SYSTEM

When the temperature of engine coolant is

relatively low, the thermostat shall turn it off, and the
coolant shall circulate and flow among the cylinder
block, water pump and warm air exchanger. This kind
of circulation is called small circulation.

When the temperature of engine coolant is

relatively high, the thermostat shall turn it on, the
coolant shall flow into the radiator, the electrically
-driven fan shall operate to lower down the temperature
of coolant. And then the coolant shall flow back to the
engine cylinder block. This kind of circulation is called
big circulation. As the big circulation operates, the
small circulation shall also play its role.

As the engine works under normal work

temperature the engine coolant shall expand. Under this
circumstance, the overflow valve installed on the
thermostat chassis shall turn it on, the coolant shall
flow into the expansion water tank through the
overflow pipe; and as the system cools down, the
coolant shall flow back to the water pump inlet from
the expansion reservoir.

The operation of electrically-driven fan is

controlled by the thermo-switch installed on the right
water chamber of radiator. When the contact points of
thermo-switch meet together, the electrically-driven fan
shall run. The water temperature sensor is fitted on the
back of cylinder head lying at the side of exhaust pipe.

Hose

Warm Air/Heat Exchanger

Expansion Tank

Pressure Cap

Engine

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P

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Cooling Water Pipe Assembly

Electrically-Driven Fan

Thermostat Chassis and
Thermostat Assembly

Water Temperature Sensor

Hose

Hose

Hose

Hose

Radiato

Thermo-Switch

Hose Assembly

Hose Assembly

PARAMETER OF COOLING SYSTEM

Cooling system

Parameter

Total system capacity（L） 8
Engine capacity（L） 3.3
Radiator capacity（L） 2.1

Coolant capacity

Expansion reservoir capacity（L） 0.4
Diameter: 280mm
Number of blades: 6
Operating voltage: 9-15V
Rotating speed Ι gear: high-speed engine 2000±200

low-speed engine 1800±200

Fan

Rotating speed II gear: high-speed engine 2800±200

low-speed engine 2600±200

Diameter of impeller: ф72mm
Transmission rate: 1.053:1

Water pump

Opening pressure of the pressure cap: 160kPa

Front face area: 0.202m²

Radiator

Heat abstraction area: 8.93m²
Opening temperature: 85º-89º

Thermostat

Full opening temperature: 99º-102º
Switch-on temperature

gear95 Cº

gear 102 Cº

Ⅰ

Ⅱ

Switch-off temperature

gear≤84 Cº

gear≤91 Cº

Ⅰ

Ⅱ

Thermo-switch

Operating voltage: 12V

ENGINE COOLANT

Coolant Discharge:

――To demount the pressure cap of expansion

reservoir;

――To install a vessel under the radiator, demount

the radiator outlet hose under the radiator and
discharge the coolant.

Cooling System Cleaning:

――To discharge coolant, mount the radiator outlet

hose;

――To inject clean water up to the position of the

largest water surface of the expansion reservoir
from the expansion reservoir filler, and then close
the pressure cap;

――To start up engine to make it operate at idle speed,

preheat up to normal operating temperature, shut
down and cool down;

――To discharge coolant;

――To repeat the abovC-mentioned steps until the

discharged water is the same as the clean water;

――To clean the cooling system according to the

following methods if the coolant is not correctly
used and replaced to meet the requirements in the
former utilization:

a. To discharge coolant;

b. To demount the radiator inlet hose, insert the main

water hose into the radiator filler until the outlet
water becomes clean;

c. In order to flush out the engine, you should connect

the main water hose with the water outlet of the
thermostat to clean the engine until the discharged
water flowing from the water pump inlet becomes
clean;

d.

To repeat cleaning operations if the radiator is very

dirty, and connect the main water hose with the
radiator water outlet until the water flowing from
the radiator water outlet becomes clean.

Coolant Filling:
――To check whether the pipeline is well connected

and fastened before injecting coolant;

――To open the pressure cap; fill up coolant into the

expansion reservoir filler slowly. Since the
expansion reservoir is at the highest position in the
cooling system. Therefore, as the coolant level
rises, the air in the system shall be discharged into
the expansion reservoir and shall be discharged out
of the expansion reservoir by injecting coolant
slowly.

――To continuously inject coolant up to the highest

coolant level. And then close the filler to prevent
coolant from spilling.

――To start up the engine to make it operate at idle

speed and preheat up to normal operating
temperature. And until the fan begins to run,
observe water thermometer and check if the engine
is at overheating condition. If the coolant level in