What is a HVAC Air Door Actuator?
Modern air conditioning systems, from the late 80's until now, have become more and more advanced in their ability to deliver comfort in a variety of ways to the passengers in vehicles. Not only can passengers control how much heat or cooling they receive, but they can receive both at the same time in different sections of the vehicle's interior. This calls for significant technology enhancements, one of which is the heating ventilation and air conditioning (HVAC) air door actuator. These actuators respond when the controls for the HVAC system are moved, and cause the air of a desired temperature to come out of a desired vent.
How do HVAC Air Door Actuators work?
When the controls on the air conditioner electronic (or vacuum controlled) controller are changed by the passenger, it controls the air door actuators. The HVAC air door actuators will respond to this input by following their programming, and changing the position of the air doors inside the HVAC ducts to accommodate the request of the passenger. For instance, if the air door controls how much air moves across the heater core, the HVAC air door actuator would move the door when the temperature setting is raised or lowered.
What are the symptoms of a bad HVAC Air Door Actuator?
Air door actuators fail in a couple of different ways. Passengers most often notice that the temperature on one or both sides of the vehicle are incorrect. Setting the temperature, even to the far opposite range may not lead to a change in the temperature of the air coming from the vents. Also, repeated clicking of clunks from underneath the instrument panel may be another indicator of a failed actuator. Another form of failure is to notice that the air is blowing out of the incorrect vent, cannot be changed to one or more vents, or even changes only with deceleration, acceleration, bumps, or hills.
Can I drive with a bad HVAC Air Door Actuator?