If still functions well, no leaks or no visible tendency to crack in near future. No need to replace it, maintain it for a while until you find obvious reason to replace it with a new one. What you must worry most is your radiator hoses and bypass hoses. Radiator coolant has anti rust and corrosion inhibitors aside from anti freeze. Most probably required maintenance is to replace radiator coolant every year. Or read your owners manual the required interval in replacing your radiator coolant.
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