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The heater blend door actuator is a small electric motor and gear that is connected to the heating and A/C/ system's control module. This then controls the blend door or vent door that mixes warm and cool air to be sent to the vehicle's cabin vents. When the desired temperature is selected using the controls on the dash of the vehicle, the actuator adjusts the position of the blend door to achieve the proper ratio of hot and cold air that is blended together before being directed through the vents. Some vehicles may also be equipped with multiple blend door actuators to control different zones or areas of the cabin. This allows independent temperature control to be possible for the driver and passengers. If the blend door actuator fails or malfunctions, it can lead to issues with temperature control in the vehicle's cabin. Common symptoms of a faulty blend door actuator include an inability to adjust the temperature, inconsistent airflow, or your heating and cooling system being stuck at a specific temperature setting. If you need to repair your vehicle's heating and air system, shop O'Reilly Auto Parts for replacement blend door actuators, control units, and more for a complete climate control repair.