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Is the cooling fan working as it should? Another possibly is air trapped in the system. Remove the radiator cap, set the heater to hot, start the engine and watch for air bubbles escaping from the radiator. Keep it topped of while doing this, and when you see no more air bubbles, put the cap back on and shut it down.

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Q: What would make your 1999 buick century go to the red in overheat and the heater start throwing out cold air you have replaced the water pumpradiatorradiator cap and thermostat?
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