1. Coolant

Coolant (also known as antifreeze) is a liquid that helps regulate your engine’s temperature by absorbing heat and preventing the engine from overheating or freezing. It flows through the engine and radiator in a closed loop, keeping everything at the right operating temperature.

  • The engine heats up as it runs.
  • Coolant circulates through the engine, absorbing heat.
  • Then it flows through the radiator, where it's cooled by air.
  • The thermostat and water pump control the flow and temperature.
Coolant

Refilling coolant/antifreeze. © Wikimedia.org/Gasper12345, CC BY-SA