Heat is produced in the engine cylinders during combustion of the fuel and air causing high cylinder temperatures. The cooling system removes heat from the engine quickly and continuously to prevent overheating which would cause a reduction in engine performance and, in extreme cases, seizure and damage to the engine components. Excessive cooling will also cause a reduction in engine performance by reducing combustion efficiency and will lead to excessive cylinder bore wear and dilution of sump oil caused by unburned fuel oil passing between the piston and cylinder. Control of cooling is therefore imperative if the best performance is to be obtained from an engine.


Types of Cooling System

Basically, there are two major type of automobile cooling system. Namely:

  • Air Cooling (Fan Cooling)
  • Liquid Cooling (water Cooling)


Heavy vehicle engines are usually multi-cylinder in-line types which are difficult to cool uniformly by an air cooling system. For this reason, air cooling is seldom use. In the few engines where air cooling is used however, a fan and a cowling Director air to the hotter parts of the engine where cooled air is most required, but this equipment is bulky and the fan is power absorbing.

Read full article on Air Cooling System


Liquid cooling system are normally used for heavy vehicle engines. The coolants absorbs heat from the engine and is circulated to the radiator which transfers the heat to the cool air passing through it.

Read full article on Water Cooling System and How Thermo-syphon cooling system Works