Because a car engine will produce a lot of heat as it runs, there is a need for it to be continuously cooled and can contain various part from Control Unit, Hoses/ Pipes/ Flanges, Radiator Fan, Sender Unit, coolant temperature, Thermostat/ Gasket, Water Pump/ Gasket etc it only take one of these parts for your engine to overheat. The most common way that this is done is by a coolant liquid circulating around. Some engines use an air flow system rather than water. With an engine that is cooled by water, the block and cylinder head are connected by a 'coolant channels' that are routed through them. All of the channels meet in one outlet, which is situated at the top of the cylinder head.
There is a pump that circulates the coolant, and this gets its power via a belt operated from the crankshaft. The coolant liquid is pumped out of the engine into the radiator system, which acts as a heat exchanger. To get the water from to radiator into the engine, rubber hoses are used. The standard temperature that the engine runs at is a little below boiling. To stop the boiling temperature being reached, the systems pressure is increased, which has an effect of raising the boiling point.
Modern cars have a sealed cooling system, which includes an overflow tank. For optimum effectiveness, the radiator requires a constant flow of cold air. This is provided by the fan. An air-cooled engine works on the same principle, but the cylinder head and the block have 'air' fins on the outside.
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