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SsangYong Rexton. Service manual - part 65

DI06-9

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Y220_06013

Viscous fan clutch

1. Clutch housing

2. Drive disc

3. Flange

4. Seal ring

5. Needle bearing

6. Cooling fan

7. Oil scraper

8. Spring

The cooling speed increases approx. 1,000 rpm with wind
noise when the engine speed is 4,000 to 4,500 rpm and
the coolant temperature is 90 to 95°C.

The cooling fans are mounted behind the radiator in the
engine compartment. The electric cooling fans increase
the flow of air across the radiator fins and across the con-
denser on air conditioner. The fan is 320 mm in diameter
with five blades to aid the airflow through the radiator and
the condenser. An electric motor attached to the radiator
support drives the fan.

1. A/C Off or Non-AC Model

• The cooling fan operates at low speed when the

coolant temperature reaches 95°C and at high
speed when the coolant temperature reaches
100°C.

• The cooling fan is turned from high speed to low

speed at 97°C and turns off at 90°C.

2. A/C On

• The ECU will turn the cooling fan on at high speed

when the A/C system is on.

Engine coolant temperature sensor

The Engine Coolant Temperature (ECT) sensor uses a tem-
perature to control the signal voltage to the Engine Control
Unit (ECU).

9. Pin

10. Bi-metal

11. Bracket cover

12. Separator disc

13. Supply port

14. Lever valve

15. Oil chamber

16. Operating chamber

Y220_06014

Y220_06015

Notice

Keep hands, tools, and clothing away from the engine
cooling fans to help prevent personal injury. This fan
is electric and can turn on even when the engine is
not running.

Notice

If a fan blade is bent or damaged in any way, no attempt
should be made to repair or reuse the damaged part.
A bent or damaged fan assembly should always be
replaced with a new one to prevent possible injury.

DI06-10

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Cooling system

Coolant

Thermostat

Cooling fan

Coolant reservoir

Water pump

Radiator

Coolant tempera-
ture sensor

Anti-freeze agent

SPECIFICATIONS

Type

Capacity

Type

Initial opening temperature

Fully opening temperature

Fully closing temperature

Stroke

Type

Blades

Diameter

Low speed ON temp

Low speed OFF temp

High speed ON temp

High speed OFF temp

High speed ON temp. (By A/C pressure)

pressure valve opening pressure

Vacuum valve opening pressure

Type

Impeller diameter

Impeller blades

Type

Core width

Core height

Core thickness

Minimum radiation capability

Resistance (at 20°C)

Resistance (at 80°C)

Type

Mixture ratio (water and anti-freeze)

Description

Water cooling forced circulation

11.3

Wax pellet type

100

min. 8

Electric

320 (2)

270

1.2 ~ 1.5

0.1

Turbo centrifugal

72.3

Down-flow

701

372

45,000

3.33 ~ 3.78

0.32 ~ 0.35

ALUTEC-P78

50 : 50

Specification

°C
°C
°C
°C
°C
°C

°C
°C
°C
°C

psi

Kg/cm

Kcal/h

Ω

−
−

Unit

DI Engine

IDI Engine

DI Engine

IDI Engine

DI Engine

IDI Engine

DI Engine

IDI Engine

DI06-11

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Y220_06016

Coolant Level Check

1. Place the vehicle on a level ground and check the coolant level through the coolant reservoir.

2. Add if needed. Change the coolant if necessary.

Notice

• Scalding hot coolant and steam could be blown out under pressure, which could cause serious injury. Never

remove the coolant reservoir cap when the engine and radiator are hot.

• Take precautions to prevent antifreeze coming in contact with the skin, eyes or vehicle body. If contact

happens, rinse affected areas immediately with plenty of water.

DI06-12

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Y220_06018

Y220_06017

Coolant Temperature Sensor

Coolant temperature sensor is a NTC resister that sends coolant temperature to ECU.

NTC resister has characteristics that if the engine temperature rises, the resistance lowers so the ECU detects lowering
signal voltages.

If the fuel injected into the engine through injector has more turbulence, then combusts very well. However, if engine tempera-
ture is too low, the fuel injected as foggy state forms big compounds causing incomplete combustion. So the sensor detects
coolant temperature and changes coolant temperature changes into voltage then sends to ECU to increase the fuel volume
during cold start for better starting. And detects engine overheating for fuel volume reduction to protect the engine.

ECU functions as below with coolant temperature sensor signals.

• When engine is cold, controls fuel volume to correct idle speed

• When engine is overheated, controls electrical fan and A/C compressor to protect the engine

• Sends information for emission control

Temp.

Resistance

Temperature

120

NTC 2 Resistance (

Ω

Ω )

6,062

1,800

638

200

NTC 1 Resistance (

Ω

Ω )

2,550

826

321

123

Auto amp

Signal

Ground

Content .. 63 64 65 66 ..