Ford Mustang passenger side heat issue due to malfunctioning blend door actuator on Ford Mustang

Some Ford Mustang owners report experiencing heat control issues on the passenger side due to a malfunctioning blend door actuator, which has been known to fail annually since 2017. These problems can lead to uneven airflow, resulting in hot air on one side of the cabin and cold air on the other. An initial sign of a faulty blend door actuator is the inability to switch from cold to hot air, indicating a loss of control over the blend door's position. Additionally, issues may arise from various causes, including a defective actuator, loose wiring connections, or a faulty control module. Some drivers have noted a clicking or knocking sound from underneath the dash when this issue occurs. If the blend door actuator fails, it can prevent cold air from reaching the vents, despite the air conditioning system functioning properly, which is a common concern among drivers.