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To recalibrate HVAC blend doors, first, turn off the vehicle and disconnect the battery to reset the system. Then, reattach the battery and start the vehicle, allowing the HVAC system to cycle through its modes. Access the blend door actuator through the dashboard or under the dash, depending on the vehicle, and use a scan tool to perform an actuator calibration if available. Finally, verify the operation of the blend doors by adjusting the temperature settings and ensuring proper airflow from the vents.

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