SsangYong Rexton. Service manual - part 64

DI06-5

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

6

4

1

2

3

5

Y220_06004

Y220_06003

Function Description

• Cylinder head coolant outlet port is integrated into intake manifold. (in front of cylinder #1)

: Improved shape and gasket material to prevent coolant from leaking

• In OM 600 engine, coolant inflows through the heater line rear section (cylinder #4 and #5) of cylinder head. However,

in D27DT engine, coolant inflows from cylinder block through oil cooler (refer to  coolant flows layout in previous
page).

: It prevents cooling efficiency from decreasing due to coolant separation between cylinder #4 and #5.

• In OM 600 engine, the cooling fan is installed with water pump, however, in case of D27DT engine, it is connected to

water pump with an additional pulley.

Cylinder Head

Intake Manifold

Coolant Outlet Port

From cylinder head

From reservoir

From heater

DI06-6

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Radiator

This vehicle has a lightweight tube-and-fin aluminum radiator.
Be careful not to damage the radiator core when servicing.

Water pump

The belt-driven centrifugal water pump consists of an impeller,
a drive shaft, and a belt pulley. The impeller is supported by a
completely sealed bearing.

The water pump is serviced as an assembly and, therefore,
cannot be disassembled.

Coolant reservoir

The coolant reservoir is a transparent plastic reservoir, similar
to the windshield washer reservoir. The coolant reservoir is
connected to the radiator by a hose and to the engine cooling
system by another hose. As the vehicle is driven, the engine
coolant heats and expands. The portion of the engine coolant
displaced by this expansion flows from the radiator and the
engine into the coolant reservoir. The air trapped in the radia-
tor and the engine is degassed into the coolant reservoir.

When the engine stops, the engine coolant cools and
contracts. The displaced engine coolant is then drawn back
into the radiator and the engine. This keeps the radiator filled
with the coolant to the desired level at all times and increases
the cooling efficiency. Maintain the coolant level between the
MIN and MAX marks on the coolant reservoir when the sys-
tem is cold.

Y220_06006

Y220_06007

Y220_06005

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.

DI06-7

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

Thermostat

A wax pellet-type thermostat controls the flow of the engine
coolant through the engine cooling system. The thermostat is
mounted in the thermostat housing to the front of the cylinder
head. The thermostat stops the flow of the engine coolant
from the engine to the radiator to provide faster warm-up, and
to regulate the coolant temperature. The thermostat remains
closed while the engine coolant is cold, preventing circulation
of the engine coolant through the radiator. At this point, the
engine coolant is allowed to circulate only throughout the heater
core to warm it quickly and evenly. As the engine warms, the
thermostat opens. This allows the engine coolant to flow
through the radiator where the heat is dissipated. This open-
ing and closing of the thermostat permits enough engine cool-
ant to enter the radiator to keep the engine within proper en-
gine temperature operating limits. The wax pellet in the ther-
mostat is hermetically sealed in a metal case. The wax ele-
ment of the thermostat expands when it is heated and con-
tracts when it is cooled. As the vehicle is driven and the en-
gine warms, the engine coolant temperature increases. When
the engine coolant reaches a specified temperature, the wax
pellet element in the thermostat expands and exerts pressure
against the metal case, forcing the valve open. This allows the
engine coolant to flow through the engine cooling system and
cool the engine. As the wax pellet cools, the contraction al-
lows a spring to close the valve.

The thermostat begins to open at 85°C and is fully open at
100°C. The thermostat closes at 85°C.

Y220_06008

Thermostat

Operating

Temperature (°C)

Opening Value (mm)

Begins to open

Fully open

0.1 mm

8 mm

85°C

100°C

DI06-8

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

COOLING SYSTEM

DI ENG SM - 2004.4

When closed (up to 85°C)

When partially opened (85°C ~ 100°C)

When fully opened (above 100°C)

If the cooling system is fully filled with, the coolant is auto-
matically bled through ball valve (arrow) in thermostat.

X. from vrankcase

Y. to crankcase

Z. from radiator

Y220_06011

Y220_06012

Y220_06010

Y220_06009