What Happens When An A/C Actuator Goes Bad? You might be thinking to yourself, what is an Actuator? We have had a few vehicles come in with this issue, that can range from a quite difficult job, to one not so intricate. Depending on your vehicle make and model this might be an extensive repair, in other cases, it could be a quick fix. An Actuator or Blend Door Actuator, is a small electric motor in your vehicle that runs in forward and reverse motion to move the Blend Door/ Air Mix Door between fresh air and re-circulation modes, hot and cold air flow, and floor/defrost modes. The Actuator is what actually went out with one of these vehicles. So, the Blend Door was not swinging back and forth, causing the hot/cold airflow to be minimal. In another vehicle, we diagnosed a similar issue but the Actuator was working correctly. The ... read more