Cooling System; General Description - Daewoo G424 Gasoline Service Manual

COOLING SYSTEM

General Description

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Cooling System Schematic
(1) Cylinder head. (2) Thermostat. (3) Recovery tank. (5) Radiator top hose. (6) Radiator pressure cap.
(7) Cylinder walls. (8) Radiator. (9) Radiator lower hose. (10) Water pump.
Water pump (10) is installed on the front of the
cylinder block. The water pump is driven by a single V
belt from the crankshaft pulley. The inlet opening of
the water pump is connected to the radiator lower
hose (9). The outlet flow from the water pump goes
through passages inside the cylinder block.
The coolant from the water pump through the
cylinder block passages has primary coolant flow to
and around the seats for the exhaust valves. This method
gives the coolant with the coolest temperature flow to the
hottest area during engine operation.
Cylinder walls (7) are cooled by the coolant flow
through the block. After the coolant goes through the
cylinder block it flows through cylinder head (1) to the
thermostat housing,
thermostat (2) is installed. The thermostat controls the
opening to radiator (8) to control the temperature in
the cooling system.
If the coolant is cold (cool), the thermostat will be closed.
The coolant circulates (makes a complete circuit) from the
water pump and through the cylinder block until the
temperature of the coolant is warm enough to make the
thermostat open. When thermostat (2) is open the coolant
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where the bypass
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will go through radiator top hose (5) and into the top tank
of radiator (8). Coolant then goes through the cores of the
radiator. The air from the fan will make the coolant cool as
the coolant flows to the bottom of the radiator and out
hose (9) where the coolant returns to water pump (10).
The radiator is equipped with a shroud to increase the
efficiency of the fan and cause the air to be pushed
through the radiator and away from the lift truck.
If the coolant is hot and the cooling system pressure is
too high, some coolant flows to the top of radiator (8)
through the tube to recovery tank (3). The cooling
system pressure is controlled by cap (6). When the
cooling system pressure goes above its rated pressure, a
valve opens in pressure cap (6) which releases the
type cooling system pressure to the atmosphere. After the
engine is at normal temperature for operation, a
development of vacuum is present in the cooling
system. Pressure cap (6) permits air in the radiator to
remove the vacuum at the same time coolant from
recovery tank (3) is pulled back into the radiator.
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Cooling System