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main applications - KS Motor

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ENGLISH<br />

BASICS<br />

2. Product Information<br />

22<br />

Radiator<br />

core<br />

Heater tank<br />

Radiator<br />

Thermostat<br />

2.1 Water pumps<br />

2.1.1 Cooling Circuit<br />

The cooling system constitutes a<br />

closed circuit. Its function is to safeguard<br />

the thermal balance in the<br />

engine because it is only at optimum<br />

temperatures that the engine fi nds<br />

optimum operating conditions: this<br />

will result in a high effi ciency and<br />

complete combustion which in turn<br />

minimizes the impact on the environment.<br />

In accordance with the manufacturer<br />

specifi cation, a mixture of pure water,<br />

antifreeze and corrosion protecting<br />

agents will be used as coolant in the<br />

system. The boiling point of this mixture<br />

is above that of water and allows<br />

coolant temperatures of up to 120°C<br />

at a gauge pressure of 1.4 bar.<br />

Water pump Temperature sensor<br />

Water jacket<br />

Radiator fan<br />

Hose<br />

The thermostat will control the cooling<br />

circuit as a function of the coolant<br />

temperature: when the engine is still<br />

cold, it re<strong>main</strong>s closed so that the<br />

operating temperature is rea ched as<br />

quickly as possible (small cooling<br />

circuit); only above a defi ned temperature<br />

level will it open to activate the<br />

large cooling circuit via the radiator.<br />

The water pump, which is driven<br />

through a belt, will deliver the coolant<br />

and, after thermostat opening, ensure<br />

the uniform and quick transfer of the<br />

coolant from the engine to the radiator:<br />

there the warm coolant is cooled<br />

again – either by the slip stream, if<br />

this is suffi cient, or by a radiator fan<br />

which takes in additional air.<br />

Heater control valve<br />

Heater core

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