If you’re lucky, it’s something minor that you can fix on your own, like a loose hose clamp. There are a few obvious and not-so-obvious places where your engine coolant can pull a disappearing act, leaking away without the blatantly obvious sins of a leak. 5 Likely Reasons for Coolant Loss Without A Visible Leaks This is another extension of the engine coolant system, which helps maintain the proper operating temperature for the engine block. Some newer cars and high-performance models also have a water jacket around the intake manifold. At that point, a special gasket in the cap relieves that pressure as hot air without letting the coolant escape from the cap. If the pressure from the super-heated coolant gets too high, it is diverted to the reservoir. The entire system is pressurized and sealed to keep the coolant from boiling out of the hot engine. This keeps the engine warm while keeping it from overheating. When it does, the thermostat opens the valve, which allows the coolant to travel through the radiator again. The coolant continues to circulate until it reaches a specific temperature. It comes into play most during the coldest days of winter when you need the engine to warm up quickly. This helps the engine maintain a specific level of heat for optimal operation. If the coolant temperature drops below a certain degree, the thermostat bypasses and diverts it back to the engine block rather than the radiator. It regulates what happens to the liquid based on the ambient temperature. As the coolant fluid cools, it travels through the radiator to repeat the cycle.Ī liquid-cooled engine also has a thermostat between the engine and the radiator. It then moves through hoses to the radiator, where the outside coming in through the grill cools it. The coolant then absorbs some of the heat energy from the engine. The cooling system is driven by the water pump, which is powered by a pulley connected to the engine’s serpentine belt.Īs the serpentine belt spins, the water pump continually passes liquid through the system and into carefully engineered passages in the engine block. Most modern-day cars have a liquid cooling system made up of a radiator, a water pump, a cooling fan, hoses, and a thermostat.
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