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The radiator coolant tank is an essential part of your vehicle's engine cooling system. It serves several critical functions: it provides a reserve of coolant for the system, allows for the expansion and contraction of coolant as the engine heats up and cools down, and acts as the main fill point for the system. Over time, the plastic material of the tank can become brittle and crack due to constant temperature fluctuations, leading to slow leaks. A failing or leaking coolant tank can result in low coolant levels, which can cause the engine to overheat and lead to costly damage. This direct-fit replacement is designed to restore the integrity of your cooling system, ensuring proper fluid levels and pressure to keep your engine running at its optimal temperature.