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Engine cooling: Without a thermostat and ventilator the vehicle overheats

Engine cooling has the task to eliminate most of the heat created during the combustion process, thus preventing damage. Alternatively the oil would exceed its maximum heat resisting temperature and the lubrication film would disappear or the valves would get burned. Today water cooling is used full scale, it consists of water circulation controlled by a thermostat, including a radiator and a cooling fan.

Thermostat and cooling fan: Work areas in engine cooling

The thermostat supports the engine in making it reach its operational temperature as quickly as possible and to keep it at that level. This is important for a flawless and efficient operation. When the engine temperature is low, directly after start-up or during low engine strain, the thermostat closes and leads the cooling water back to the engine via a short circuit loop instead of leading it to the radiator. In order to accomplish that, the thermostat has an expansion element which is permanently subjected to the cooling liquid and when a pre-set temperature is exceeded it changes two poppet-valves over. Inside the engine is a mixture of radiator- and recycled short circuit loop fluid. At a point when only hot fluid arrives, the thermostat opens fully, whereby a sudden cooling effect with warping and cracks are prevented. In general the temperature for opening is at approximately 90°C.

The cooling fan is another important component for cooling which is mounted behind the radiator and is usually connected with the fan belt also operating the alternator. The fan is activated by a thermo switch which for example activates it when driving is interrupted. An applicable case is a longer period of standstill because of traffic jams or stop-and-go traffic at high outside temperatures.

These and other parts from the area of engine cooling are ready at rexbo Car Parts.