Noticed this on my Dodge Grand Caravan this past summer when travelling and sleeping in the back. Every so often, there will be a cycle where various vents seem to be opening and closing on their own. Seemed to happen every half hour. Kind of spooked me at first, as it seemed the it had a mind of its own. What process is actually happening here?

Seems like I found my answer here.

https://forum.chryslerminivan.net/sh...van-turned-off