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If your Mercury Sable is stuck on the defrost setting and won't switch to the dashboard vents, it could be due to a malfunctioning blend door actuator or a vacuum leak in the HVAC system. Check the actuator for proper function, as it controls the direction of airflow. Additionally, inspect the vacuum lines connected to the HVAC system for any leaks or disconnections. If these components are functioning correctly, there may be an issue with the climate control unit itself.

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2mo ago

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