What is antifreeze?
Peter Sitkowski | 9th Sep 2024 | 7 minutes to read
Antifreeze, the main component of commercial coolants, plays a critical role in maintaining the health and performance of your vehicle. It is not just about keeping your engine from freezing in cold weather; antifreeze also ensures that your engine doesn’t overheat, even on the hottest days.
Understanding what antifreeze is and why it is essential for your vehicle can help you better maintain your car and avoid costly repairs down the line:
What is Antifreeze Made Of?
Antifreeze is a liquid substance, typically made from a combination of water and glycol, that circulates through your vehicle's engine and radiator. The most common type of glycol used in antifreeze is ethylene glycol, though some formulas use propylene glycol, which is less toxic but slightly less effective.
Although coolant and antifreeze are often used interchangeably, they aren’t the same thing. When you buy coolant for your vehicle, this is usually a mixture of antifreeze and water with additional anti-corrosives and other additives that help to keep your engine from overheating and maintain internal components.
What Does Antifreeze Do?
The primary function of antifreeze is to regulate the engine's temperature. It does this by lowering the freezing point of water in the engine during cold weather and raising the boiling point of water during hot weather. This dual action helps prevent the engine from freezing in the winter and overheating in the summer, ensuring that it operates within a safe temperature range under all conditions.
Temperature Regulation
One of the most critical roles of antifreeze is its ability to regulate the engine's temperature. Engines generate a significant amount of heat during operation, and without proper cooling, this heat can cause severe damage. Antifreeze helps absorb the excess heat produced by the engine and dissipates it through the radiator. This process prevents the engine from overheating, which could lead to catastrophic engine failure.
In colder climates, antifreeze is equally important as it prevents the coolant from freezing. If the coolant were to freeze, it could expand and cause significant damage to the engine block, radiator, and other components. This makes antifreeze indispensable for those who live in regions with extreme temperatures.
Corrosion Prevention
Antifreeze also contains additives that help protect the engine's internal components from corrosion. Over time, the metals within the engine and cooling system can corrode due to exposure to water and other environmental factors. The additives in antifreeze form a protective layer on the metal surfaces, reducing the risk of corrosion and extending the life of the engine.
Without antifreeze, rust and corrosion could build up in the cooling system, leading to blockages and reducing the efficiency of heat transfer. This could cause the engine to overheat and potentially result in costly repairs.
Lubrication of Components
Another benefit of antifreeze is its ability to lubricate the various components within the cooling system. The water pump, a crucial part of the system, relies on the lubricating properties of antifreeze to function smoothly. The lubrication provided by antifreeze reduces wear and tear on the pump and other components, contributing to the overall longevity of the cooling system.
Compatibility with Different Vehicles
Modern antifreeze formulations are designed to be compatible with a wide range of vehicles, including both petrol and diesel engines. There are different types of antifreeze available, such as Inorganic Acid Technology (IAT), Organic Acid Technology (OAT), and Hybrid Organic Acid Technology (HOAT). Each type is formulated to meet the specific needs of different engines and cooling systems.
It is essential to use the correct type of antifreeze for your vehicle, as using the wrong type can lead to issues such as coolant leaks, corrosion, and reduced cooling efficiency. Always consult your vehicle’s owner manual or a professional mechanic to determine the best type of antifreeze for your specific vehicle.
Common Misconceptions About Antifreeze
There are several misconceptions about antifreeze that can lead to improper maintenance practices.
One common myth is that antifreeze only needs to be added during the winter months. While it is true that antifreeze helps prevent the engine from freezing, it is also crucial during the summer to prevent overheating. Therefore, antifreeze should be checked and maintained year-round, regardless of the season.
Another myth is that water can be used as a substitute for antifreeze. While water does have some cooling properties, it lacks the necessary additives to prevent corrosion and does not provide the same level of temperature regulation as antifreeze. Using water alone can lead to significant engine damage over time.
Finally, some people believe that antifreeze lasts forever and does not need to be replaced. In reality, antifreeze degrades over time and loses its effectiveness. It is essential to follow the manufacturer’s recommendations for antifreeze replacement, typically every two to five years, depending on the type and usage of the vehicle.
Signs That Your Vehicle Needs Antifreeze
Knowing when your vehicle needs more antifreeze or when it’s time to replace it is crucial for maintaining the health of your engine. Some common signs that your vehicle may need antifreeze include:
Overheating Engine
If your engine is running hotter than usual, especially during warm weather, it may be a sign that your coolant levels are low or that the antifreeze has degraded.
Sweet Smell from the Engine Bay
Antifreeze has a sweet, almost syrupy smell. If you notice this smell coming from your engine bay, it could indicate a coolant leak.
Visible Leaks Under the Car
If you see a puddle of bright green, yellow, or pink fluid under your car, it’s likely antifreeze. This could be a sign of a leak in the cooling system, which should be addressed immediately.
Warning Lights on the Dashboard
Many modern vehicles are equipped with sensors that monitor coolant levels and temperature. If your dashboard displays a coolant warning light, it’s time to check your antifreeze levels.
How to Check and Add Antifreeze
Regularly checking and maintaining your antifreeze levels is a simple task that can prevent major engine issues. Here’s a basic guide on how to check and add antifreeze:
Ensure the Engine is Cool
Never open the radiator cap when the engine is hot, as the pressurised coolant can cause severe burns.
Locate the Coolant Reservoir
Most vehicles have a translucent coolant reservoir with minimum and maximum markers on the side. This is where you can easily check the coolant level.
Check the Coolant Level
If the coolant level is below the minimum marker, it’s time to add more antifreeze. Ensure that you use the correct type for your vehicle.
Add Antifreeze
If the level is low, slowly add the correct type of antifreeze to the reservoir until it reaches the maximum marker. Be careful not to overfill.
Replace the Cap and Monitor
After adding antifreeze, replace the cap securely and monitor your vehicle for any signs of leaks or overheating.
Look After Your Car With Antifreeze
Antifreeze is more than just a seasonal necessity; it is a year-round protector of your vehicle's engine. From regulating temperature to preventing corrosion and lubricating critical components, antifreeze is vital for the long-term health of your car. Regular maintenance, including checking and replacing antifreeze as needed, will ensure that your vehicle runs smoothly, regardless of the weather conditions. By understanding the importance of antifreeze and taking the necessary steps to maintain it, you can protect your engine from costly damage and keep your vehicle performing at its best.
