The Kia Optima Coolant Reservoir protects the engine by collecting excess coolant and recycling it to maintain coolant system overflow and keep it air-free. Across the generations, Kia's choice was two styles of reservoir, a non-pressurized overflow tank and a pressurized expansion tank, designed for specific Optima cooling layouts. This Coolant Reservoir with the simple plastic cap is beside the radiator and in normal driving the radiator pressure cap opens only when the heat causes liquid to expand and thus sends coolant into the Coolant Reservoir and later draws it back via the same hose as the engine cools down. Newer or higher spec models of Optima often carry the pressurized expansion style, where the pressure-rated metal cap mounts right on the Coolant Reservoir itself, the container is thicker reinforced plastic since it shares full system pressure, and it's mounted right to the high point, so any air released through the cap never churns the coolant. Whichever kind is applied in a Kia Optima, clear level lines make it easy to ensure the Coolant Reservoir has the right volume when cold, so any Kia owner can catch problems early and ward off leaks and rust.
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