KATHMANDU: Ever wondered why your car doesn’t overheat even after long drives? The main reason is the engine’s cooling system. In vehicles that run on fuel, the engine creates energy by burning fuel.
However, only a small portion about 25 to 30 % of this energy is used to move the vehicle. The rest turns into heat. If this heat is not controlled properly, it can damage the engine. Problems like overheating, a damaged cylinder head or even a seized piston can occur leading to expensive repairs or complete engine failure.
That’s why the engine cooling system is known as the vehicle’s quiet protector.
Main parts of the cooling system
The cooling system is made up of several important components. The radiator plays a key role by releasing heat from the coolant into the air. The coolant, which is a mix of water and a chemical called ethylene glycol, helps keep the engine from getting too hot or freezing in cold temperatures.
Another major part is the water pump, often referred to as the heart of the cooling system. It keeps the coolant flowing through the engine and the radiator. The thermostat acts like a smart valve, it opens only when the engine is hot enough allowing the coolant to flow.
Cooling fans help by blowing air through the radiator to cool things down further. Various pipes and a reserve tank help manage the coolant flow and pressure throughout the system.
How it all works
When you start the engine it begins to heat up. The coolant absorbs this heat. As the temperature rises the thermostat opens and allows the heated coolant to travel to the radiator. There the coolant cools down and is sent back to the engine. This process keeps repeating while the engine runs helping maintain a stable temperature.
What if the cooling system fails?
If the system doesn’t work properly it can seriously damage the engine. You might notice signs like the temperature gauge going up, smoke coming out from under the hood, coolant leaking beneath the car or a burning smell. These are warnings not to be ignored. Acting early can prevent costly repairs later on.
Smarter technologies in modern vehicles
Today’s vehicles are equipped with more advanced and efficient cooling systems. Features like electric water pumps, dual-circuit cooling for hybrid and electric vehicles and variable-speed fans help manage engine temperature more precisely. In electric vehicles (EVs) cooling systems are also used to control the heat in batteries and motors.
To keep the cooling system in good shape it’s important to replace the coolant every 2 to 5 years, check pipes for leaks, clean or inspect the radiator and avoid opening the radiator cap when the engine is hot.
Although the cooling system isn’t a part you’ll see shining on the outside it quietly keeps everything running smoothly. With the use of smarter technology it’s now more reliable and efficient than ever.
