[Texas Bulldog]

I just bought and got back from paint a '68 GTO. It has hidden headlights and one opens when the car is shut off. They stay closed going down the road and the body guys said they opened when you turned on the headlights, they are not doing that now though.
Any ideas as to where to start?, do you have to remove the lower valance to get at the actuators, or should I remove the grill?
Thanks,
Texas Bulldog

 

[DaveH]

I would look for a cracked or disconnected vacuum line(s).