Posted on 2/27/2026
Modern vehicles use long-life coolant, so it is fair to wonder if a coolant flush is truly needed. The reservoir can look clean, the temperature gauge can sit right in the middle every day, and nothing feels wrong behind the wheel. However, cooling systems are still aging quietly in the background. Coolant is not only there to prevent freezing, but it also protects the inside of your engine and radiator from corrosion and buildup over time. What Coolant Actually Does In A Modern Engine Coolant carries heat out of the engine and into the radiator so the engine stays in a controlled temperature range. It also lubricates certain sealing surfaces, especially in the water pump area, and it contains additives that prevent rust and corrosion inside the system. Modern cooling systems use a mix of materials, including aluminum, plastic, and different types of seals. Those materials depend on the coolant’s additive package to stay protected. When the additives weaken ... read more