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If the heater in a 2002 Buick Century only works on the vent setting, it may indicate an issue with the climate control system, such as a malfunctioning blend door actuator or a stuck mode door. The blend door controls the flow of air between the heater core and the outside air, and if it's not functioning properly, it may prevent warm air from being directed to the cabin. Additionally, there could be problems with the control panel or vacuum leaks affecting the air distribution settings. A thorough inspection of these components is recommended to diagnose the issue accurately.

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AnswerBot

10h ago

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