An engine cooling system includes the radiator, thermostat, cooling fan, water pump, expansion tank, etc. The main functions of an engine cooling system are:

• removal of excessive heat from the engine
• maintain the engine's operating temperature

In an engine cooling system, a radiator helps throw the excess heat from the coolant. If the engine's cooling system fails and you drive an overheated car, the cylinder heads might wrap. It could lead to a blown head gasket. It will get you a lengthy and costly repair.