The process of reducing air temperature by dissipating heat is known as air cooling. The amount of heat dissipated to air depends upon the amount of air that flows through air-reducing fins that transport and discharge heat, resulting in improved airflow and lower temperatures and thermal conductivity of metal usage.
- The system's role is to have a constant current of air running over the hot engine surface from which the heat ejected. The vehicle's air cooling system does not require coolant and antifreeze solutions and can be used in cold climates. In contrast with water cooling systems, Air cooling systems do not produce leakages.
To prevent freezing of the water in the cooling system antifreeze is added to form the coolant. The coolant is the liquid that circulates through the cooling system. It removes waste heat from the engine and delivers the heat through the radiator hose to the radiator. This cools the liquid which continuously recirculates through the water jackets, repeating the cooling cycle
- The most commonly used antifreeze is called ethylene glycol. It is a mixture if half water and half ethylene glycol in the recommended coolant for year-round use in most cars
- Antifreeze contains several additives. These included a corrosion inhibitor and a foam inhibitor. Corrosion or rust can shorten the life of metal parts. It is also capable of forming an insulating layer which reduces heat transfer from the metal to the coolant. In engines, with severe corrosion, the coolant may be at normal temperature while the cylinders and head are overheating. One reason for having 50% antifreeze is to ensure the cooling system contains an adequate amount of corrosion inhibitor.