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Cooling 1


The cooling system's task is to regulate the operating temperature of the engine, and all parts of the engine in such a way that the temperature is quickly reached and held as precisely as possible. The temp. should not be allowed to fall below the operating temp., which should also not be exceeded. Too high an operating temp. endangers the engine directly, too low is detrimental to the exhaust emission values, the fuel consumption and the lifespan of the engine. Especially beneficial, e.g., for the partial load area is the electronically regulated cooling. In addition, in closed vehicles, for safety reasons, the side windows and the windscreen may not steam up, causing visibility to be impeded (interior heating).


Only one third of the warmth originating from the internal combustion engine can be converted into kinetic energy. Roughly another third escapes through the exhaust. Because the strain on the materials would be too high, the remaining heat must also be passed on to the environment. There is a distinction between internal and external cooling. In the case of the external cooling, the medium to which the engine delivers its heat directly, is decisive, e.g., air cooling, liquid cooling or oil cooling. 08/11

Tasks of cooling
Constant engine operating temperature
Early heating of lubrication oil
Possibly direct cooling of the lubricating oil
Cooling of the recirculated exhaust gas
Damping of engine noises
Preventing knocking combustion (petrol engine)
Heating of the interior

No.Thermostat on the cooler input (top): SequenceNo.Thermostat on the cooler output (bottom): Sequence
1Coolant pump1Coolant pump
2Engine block2Engine block
3Cylinder head3Cylinder head
4Thermostat4Cooler or short circuit
5Cooler or short circuit5Thermostat

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