Coolant systems are essential components in various machines, including cars and industrial equipment. They help regulate temperature by circulating a fluid, usually a mixture of water and antifreeze, to absorb heat generated during operation. This prevents overheating, which can lead to damage or reduced efficiency. In automotive applications, the coolant system includes parts like the radiator, water pump, and thermostat. The radiator dissipates heat from the coolant, while the water pump circulates the fluid through the engine and back. Proper maintenance of these systems is crucial for optimal performance and longevity of the machinery.