i need something called a recirculating air actuator, or something like that. i can't find it anywhere. basically, behind the dash, there's an actuator that opens and closes a little door to let in fresh air or keep the air recirculating. whenever the fan is set to fresh air, the actuator keeps wanting to open the door past the point where it should stop, so it keeps clicking. the guy who can repair the problem said he needed that part to do it. what part is it exactly and where can i buy it for cheap?