It's possible one of the actuators is being ran, but figuring out why might be more of a task.
I'd pull the batter cable off and use a multimeter to gauge how much amperage is being lost through a draw. You can use a test light too, but it won't tell you the amount, just that there is a draw (which if you have ecm/tcm/pcm/ect there will always be). Then pull the fuses for the vintage air unit and see if the the draw goes away or becomes less. If it does, then you know its the the a/c unit. If it doesn't, you can start pulling other fuses in the car until it goes away.
However, if the test light doesn't light up or the multimeter shows no draw, you just have a battery issue.
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