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Exam (elaborations)

CHAPTER 15: ENGINE COOLING SYSTEM

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CHAPTER 15: ENGINE COOLING SYSTEM The engine cooling system - CORRECT ANSWER -the engines internal combustion system takes place at about 4,500 degrees fahrenheit. Approximately one-third of the heat produced by combustion is converted into the engines power. Another third is removed through the exhaust system. That still leaves one-third of the heat that is dissipated by the engine cooling system. It is a sealed and pressurized system that uses a combination of equal parts water and coolant Coolant/antifreeze - CORRECT ANSWER -Coolant/antifreeze is added to the water to increase the boiling temperature of the mixture. Otherwise, the water would evaporate at the engines high temperatures. The addition of coolant keeps the mixture from freezing in the winter and the engine from rusting. Most coolant/antifreeze contains a substance called ethylene glycol, although some use propylene glycol, which is non toxic and less harmful. Water Pump - CORRECT ANSWER -the water pumps the water-coolant mixture through the engine cooling system via a lower radiator hose. The water pump is powered by a v or serpentine belt attached to the crankshaft. On cars with mechanical fans the water pump is generally right behind the fan. On cars with electric fans the location varies. On some cars the water pump serves two purposes: driving the fan and circulating coolant Water jackets - CORRECT ANSWER -The coolant mixture is circulated through areas called water jackerts that surround the engine cylinders and other engine hot spots. The heat of the cylinders is transferred to the cool liquid being circulated. Fan - CORRECT ANSWER -a fan mounted behind the radiator pulls cool outside air through the

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CHAPTER 15: ENGINE COOLING SYSTEM
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CHAPTER 15: ENGINE COOLING SYSTEM
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