I will try to pull some information from memory. I have the vacuum headlight actuators on my '69 Charger. Please double check me on the routing, but I believe engine vacuum goes to the vacuum canister, then from the canister to the headlight switch, then two lines go out to the headlight doors. If the headlight actuators are like on my Charger, there are two connections on the actuators,.... one to open them and one to close them.
On my headlight vacuum switch, there are three ports. The center is vacuum from the canister, the outer two are for open and close vacuum lines. When you actuate the headlights, a small rubber block (with a notch in the bottom) moves back and forth across the holes from those ports and either covers the center (vacuum source) and "open" port (causing vacuum to pull the headlight doors open), or covers the center (vacuum source) and "Close" port, pulling the headlight doors closed.
Not real sure how the rising headlight doors work on a Superbird. Are they spring assisted to the open position? Wondering what happens if you pull your vacuum lines off the actuator? Do the doors pop up? Curious if maybe they are designed to do so as a safety factor so if you lose vacuum, or the actuator fails, they will default to open position so you don't loose headlights while driving.
If so, maybe you have a leak in the "Down" vacuum lines or headlight switch and as vacuum bleeds off, the doors are wanting to pop up (open).
Of course this is all just my thoughts as I don't have a Superbird, nor do I know how that system works to pop those headlight pods up.
