I'm confused about how the Floor Door mechanically actuates. In the FSM on page HA10, the Vacuum actuator needs to move the door from closed to 1/2 open to full open. However, the mechanics of the Vacuum actuator only allows it to move 1/2 way. What moves it to the fully open position so you get defrost and floor? The arm of the actuator has what appears to be a small arm connected to a long thin rod. If the small arm had something pulling it back to its most open position, the floor door would go to the fully open position. I just don't see an added spring or any way the mechanics of what I have pulls this to the fully open position. Please advise.