Where is the blend door on a 2003 Lincoln Navigator?

The blend door on a 2003 Lincoln Navigator is located within the HVAC (Heating, Ventilation, and Air Conditioning) system. It is typically situated behind the dashboard, near the HVAC control unit. The blend door is responsible for controlling the mixture of hot and cold air that is directed into the vehicle's cabin. If there are issues with temperature control or airflow, the blend door may need to be inspected and potentially replaced by accessing it through the dashboard.