![]() The thermostat is the gatekeeper of the cooling system. The thermostat controls the flow of the coolant. Water jackets are throughout the entire engine, but are concentrated mostlyĪround the combustion chambers, as this is where the heat is generated, and The water pump uses spinning impellers to push coolant through the engine, radiator, and heater core.Ĭoolant flows through the engine via water jackets. These belts are driven by a pulley on the front of the crankshaft. The water pump is driven by the same accessory drive belts that operate the alternator, power steering pump, and the air conditioner compressor. The water pump circulates coolant through the cooling system. Here’s how an automotive cooling system uses the mechanism of heat transfer to keep your engine cool and your tootsies warm: Transfers to the ice, making the can cold.Ĭold, by definition, is the absence of heat energy. Since heatĮnergy will always move to something cooler, the heat energy in the can This is putting a warm can of soda (beer) into a cooler of ice. Heat energy will always seek out something cooler. Heat transfer is the movement of heat energy from one place toĪnother. Engine damage can happen fairly quickly when coolant temperatures start to rise near 300 degrees.Īn engine cooling system works on the principal of Engine operating temperature depends on the temperature of the coolant. That’s a lot of heat that has to be removed. Operating temperature of the engine should be in the low 200 degree range. The temperature inside the combustion chamber of a car engine, (the area where the fuel burns) can easily reach as high as 1600 deg. The only time we notice the cooling system is when it fails, and that can quite often be catastrophic. It quietly keeps your engine at operating temperature, preventing overheating, and all the while supplying toasty cozy heat to the passenger compartment. Thus, it transfers heat from the water to the passing air.The cooling system is the unsung hero of the internal combustion car engine. Furthermore, a cooling fan blows the air past the fins. Water flows from radiator's upper tank to its lower tank thru' the capillary tubes surrounded by radiator fins. When the coolant temperature rises to certain degrees, (usually above 100 degrees Celsius) the thermostat opens and allows the coolant to enter the radiator to cool down. It then circulates the coolant water within the engine to quickly attain the engine's normal operating temperature. When the engine is cold, the thermostat bypasses the radiator. Water jackets in an engine Role of Thermostat in Water Cooled Engine:Ī liquid cooled engine uses a thermostat to control the temperature effectively. A cooling fan cools down the water when it passes thru' the radiator. The heat from hot engine parts, such as the cylinder head and block is dissipated by the circulating water. Hence, the water does not evaporate quickly and can be used for prolonged time. The pressurised system helps to increase the boiling point of the water to above 110 oC. ![]() The liquid / water cooled engine uses a pressurised and closed system. The coolant also helps to increase the boiling point of the water. It also helps to prevent erosion and increases the life of engine components especially those made of aluminum. The anti-corrosion agent prevents rusting of the engine parts, such as cylinder block and head when they come in contact with the water. It also prevents causing damage to the engine. The coolant, thus prevents the water from freezing in extreme weather conditions. The coolant contains some additives, such as the anti-freezing and anti-corrosion agents. Liquid cooled engine diagram The Role of Coolant in Engines:
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