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2004 Grand Am overheats in warm weather

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I have a 2004 grand am gt 3400 v6 with 213400 miles i have overheating only when its warm out i replaced the water pump flushed the cooling system, thermostat checked for bad head gasket and my heater core appears fine i have no leaks under car and replaced coolant temp sensor and coolant. I also have a sputtering at low speeds and bucking at high speeds with egr valve plugged it egr valve was replaced when issue started. Only code i have is oxygen sensor bank 1 sensor 2 your opinion would be greatly appreciated

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Check your 18-year-old radiator for clogs and make sure cooling fans are working properly.

Will be replacing radiator fins are bent and clogged with debris. I completely over looked the radiator and yes both fans kick on thanks

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