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Does it matter what kind of coolant you get for your car?

Yes, the type of coolant you use in your car's cooling system does matter. Using the wrong coolant can lead to serious problems, such as corrosion, overheating, and even engine damage. In this article, we'll explore the importance of choosing the right coolant for your vehicle.


Understanding Coolant Types


There are several different types of coolant available, each designed for specific vehicle makes and models. The most common types are:



  • Ethylene Glycol-Based Coolant: This is the traditional green-colored coolant that has been used in vehicles for decades. It provides good corrosion protection but can be harmful if ingested.

  • Propylene Glycol-Based Coolant: This is a less toxic alternative to ethylene glycol-based coolant, often used in newer vehicles. It has a pink or orange color.

  • Hybrid Organic Acid Technology (HOAT) Coolant: This coolant is a blend of organic acids and other additives, providing improved corrosion protection. It is typically yellow or orange in color.

  • Silicate-Free Coolant: This type of coolant is designed to be compatible with aluminum components, reducing the risk of corrosion.


It's important to check your vehicle's owner's manual to determine the specific type of coolant recommended for your car. Using the wrong coolant can lead to compatibility issues and potentially damage the cooling system.


Consequences of Using the Wrong Coolant


Using the wrong coolant in your car can have several negative consequences:



  • Corrosion: Different coolant types can react with each other, leading to the formation of deposits and corrosion in the cooling system. This can cause leaks, blockages, and even engine damage.

  • Overheating: Incompatible coolants may not provide adequate heat transfer, leading to overheating and potential engine damage.

  • Reduced Lifespan: Coolants have specific additive packages that are designed to protect the cooling system components. Using the wrong coolant can reduce the lifespan of these components, leading to more frequent replacements.


To avoid these issues, it's crucial to use the coolant recommended by your vehicle's manufacturer. Mixing different types of coolant is generally not recommended, as it can lead to compatibility problems.


Maintaining Your Cooling System


In addition to using the right coolant, it's important to maintain your car's cooling system regularly. This includes:



  • Flushing and Refilling the Coolant: Most manufacturers recommend flushing and refilling the coolant at specific intervals, typically every 30,000 to 60,000 miles.

  • Checking Coolant Levels: Regularly check the coolant level in the overflow tank or radiator and top it up if necessary.

  • Inspecting for Leaks: Look for any signs of coolant leaks, such as stains or drips, and address them promptly to prevent further damage.


By following the manufacturer's recommendations and using the correct coolant, you can help ensure the longevity and proper functioning of your car's cooling system.

Can the wrong coolant cause a car to overheat?


There's a problem with your coolant: If your vehicle has the wrong coolant or you have an improper coolant-to-water ratio (50/50 is proper), your engine may be prone to overheating.



What happens if I put the wrong coolant in my car?


Using the wrong coolant can reduce cooling efficiency, leading to engine overheating and potential damage. Warranty Issues: Using an incorrect coolant may void the vehicle's warranty. Manufacturers often specify certain types of fluids to ensure optimal performance and reliability.



Are antifreeze and coolant the same thing?


The ratio of water to antifreeze in engine coolant is usually 50/50, but it can be as high as 70% water and as low as 30% antifreeze. The main difference between engine coolant and antifreeze is that engine coolant is a mixture of water and antifreeze, whereas antifreeze is an ethylene glycol-based liquid.



What do coolant colors mean?


Different colored antifreeze is used to identify the type of antifreeze being used. Inorganic Acid Technology (IAT) antifreeze is green in color. Organic Acid Technology (OAT) antifreeze is orange, red, green, pink or blue. Hybrid Organic Acid Technology (HOAT) antifreeze is orange or yellow in color.”



Does it really matter what coolant I use?


As a general rule, you shouldn't mix different types of coolant. However, nowadays, with new vehicle models, the colour of the coolant you choose doesn't always matter. Whereas on older models, using the wrong type of coolant could cause damage to the cooling system and engine.



Is it okay to use any coolant in my car?


No carmaker approves of ``all makes, all models'' coolant. Why? Because there's no way a single brew can be compatible with all the different metals, seals, plastics and gaskets used in all the different engines. Using the wrong coolant can cause internal corrosion that's costly to repair.



Can I just add coolant to my car?


If the coolant level is low, add the correct coolant to the reservoir (not the radiator itself). You can use diluted coolant by itself, or a 50/50 mixture of concentrated coolant and distilled water. When coolant rises to the cold fill line, replace cap and tighten it until you feel it click.



How do I know what coolant to put in my car?


The most common method to find out is to simply check the coolant and find out what colour it is when the vehicle is cold. Most coolant brands will keep their coolants the same colour to prevent any confusion. If you're still not sure, check the owners/service manual for coolant specifications.



Is antifreeze the same as coolant?


Well, antifreeze and engine coolant are similar, but not the same. Antifreeze is a concentrated, glycol-based liquid that must be diluted with water before use – at which point it is referred to as coolant. Alternatively, you can purchase pre-mixed engine coolant, a ready-to-use solution of antifreeze and water.



What happens if coolant is low?


Without sufficient coolant, your engine could overheat. Many modern vehicles have an automatic engine cut-off feature when the engine overheats to help prevent significant damage. If this happens, it's best to tow your vehicle to your nearest automotive professional for a proper diagnosis.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.