Why do I need engine Coolant – what does it do?

A large percentage (upwards of 60%) of the energy that’s released by burning fuel (petrol or diesel) in your car’s engine is converted to heat. While some of this heat is expelled through the exhaust, a good deal remains in the engine block. Left unchecked, the temperature in the engine would continue to rise, literally melting it and ultimately causing it to seize. A lot of engine failures can in some fashion be attributed to engine cooling issues. This is where Coolant comes in handy! ​

​Coolant is a blend of distilled water and alcohol. (However, it has to be said that it’s probably best you don’t show up at your next house party with a bottle of it under your arm!) This fluid absorbs the engine heat whilst being circulated to the car’s radiator, situated at the front of the engine block. Airflow through the radiator as the car moves forward cools the fluid. 

Coolant is also known as Antifreeze – and as the name would suggest, has essential benefits for those cold days! While water obviously freezes at 0°C, Coolant generally does not succumb to the same fate until about -37°C. At the other end of the scale, it’s boiling point increases from water’s 100°C to in excess of 240°C, depending on the water/coolant dilution ratio.

Any other benefits? Using a quality Coolant/Antifreeze and changing it regularly (most professionals would recommend flushing the cooling systems every 50,000K, or as part of an annual service) has several benefits: stops coolant system from freezing in winter or boiling in summer stops corrosion or rust of engine metal stops degradation of rubber/plastic engine components helps prevent electrolysis

Electrolysis??? Given enough time, the coolant solution can become somewhat acidic, and develop an electrical change. While this is very slight, it is nonetheless sufficient to begin a corrosive process on engine components. This reaction is referred to as Electrolysis. As visible signs of this reaction frequently mean that any intervention is somewhat late in the day, it is essential to change the solution in line with the supplier’s guidelines. 

What engine coolant to use… As we have shown, coolant/antifreeze is an essential aspect of your car’s engine. Using a quality product that is right for your engine is every bit as essential. Consult your Peters Creek Automotive professional for their advice. 


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