Antifreeze is a liquid that is added to the water in an engine’s cooling system in order to lower the freezing point. This means that the water will not freeze under normal cold weather conditions.
As well as preventing water from freezing up, antifreeze raises the boiling point of engine coolant to prevent overheating. It also protects your engine from corrosion, aids heat transfer, and prevents scale from building up internally.
There are two main types of anti-freeze – organic acid technology (O.A.T.) which is red and glycol-based which is green.
Green anti-freeze lasts for five years, and red anti-freeze has a life of ten years. At the end of its life, anti-freeze should be drained, flushed and replaced to avoid costly cooling system issues.
For example, water pump leaks and radiator blockages are a common result and can cause premature cylinder head gasket failure.