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To fix a heater air control that's stuck in defrost, first check the vehicle's climate control settings to ensure they are properly adjusted. If the settings are correct, inspect the blend door actuator and vacuum lines for any damage or disconnections, as these can prevent the system from switching modes. If the actuator is faulty, it may need to be replaced. Additionally, consider checking for any electrical issues or blown fuses related to the heating system.

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1mo ago

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