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Overview
The motor vehicle is operated in different climatic conditions and with different loads. The temperature of the coolant, and hence the motor must be controlled and in a narrow temperature range that allows the engine cooling system.
| Fig. 2.108. Driving fluid circulation in the cooling system of the engine V6 2,7 liter: a - the thermostat is closed; 1 - the water pump; 2 - cylinder head; 3 - the block of cylinders; 4 - heater radiator; 5 - throttle device; 6 - thermostat; 7 - a radiator
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The cooling system includes a sealed-type water pump, radiator fan, radiator, expansion tank, thermostat and radiator heater hoses and switches (Fig. 2.108). When starting a cold engine coolant circulates around the cylinder block and cylinder head. Warm coolant passes through the radiator heater to the water pump. Since the coolant expands when heated, it increases its level in the expansion tank. Receipt of the coolant through the radiator is closed, which provides indoor thermostat. When the coolant reaches a predetermined temperature, the thermostat opens and hot coolant flows through the radiator hose, since the cooling fluid passes through the radiator, it takes a counter-flow cooling air. The expansion tank is designed for the release of vapors into the atmosphere at a pressure above that cavitation occurs in the suction side of the water pump. The fans are designed to force the airflow of the radiator at low vehicle speed. In order to save fuel the fan is equipped with its own control system.
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