Table of Contents
Advertisement
1D-2 ENGINE COOLING
GENERAL DESCRIPTION
The cooling system maintains the engine temperature
at an efficient level during all engine operating
conditions. When the engine is cold, the cooling system
cools the engine slowly or not at all. This slow cooling
of the engine allows the engine to warm up quickly.
The cooling system includes a radiator and recovery
subsystem, cooling fans, a thermostat and housing, a
water pump, and a water pump drive belt. The timing
belt drives the water pump.
All components must function properly for the cooling
system to operation. The water pump draws the coolant
from the radiator. The coolant then circulates through
water jackets in the engine block, the intake manifold,
and the cylinder head. When the coolant reaches the
operating temperature of the thermostat, the thermostat
opens. The coolant then goes back to the radiator where
it cools.
This system directs some coolant through the hoses
to the heat core. This provides for heating and
defrosting. The coolant reservoir is connected to the
radiator to recover the coolant displaced by expansion
from the high temperatures. The coolant reservoir
maintains the correct coolant level.
The cooling system for this vehicle has no radiator
cap or filler neck. The coolant is added to the cooling
system through the coolant reservoir.
RADIATOR
This vehicle has a lightweight tube-and-fin aluminum
radiator. Plastic tanks are mounted on the upper and
the lower sides of the radiator core.
On vehicles equipped with automatic transaxles, the
transaxle fluid cooler lines run through the radiator tank.
A radiator drain plug is on this radiator.
To drain the cooling system, open the drain plug.
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 radiator 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.
DESCRIPTION AND OPERATION
Maintain the coolant level between the MIN and MAX
marks on the coolant reservoir when the system is cold.
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, there-
fore, cannot be disassembled.
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 opening and closing
of the thermostat permits enough engine coolant to
enter the radiator to keep the engine within proper
engine temperature operating limits.
The wax pellet in the thermostat is hermetically sealed
in a metal case. The wax element of the thermostat
expands when it is heated and contracts when it is
cooled.
As the vehicle is driven and the engine 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 allows a spring
to close the valve.
The thermostat begins to open at 82 ° C (180 ° F) and is
fully open at 95 °C (203 ° F). The thermostat closes at
80 °C (176 °F).
ELECTRIC COOLING FAN
Caution: 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.
SSANGYONG Y200
Advertisement
Chapters
Table of Contents
