We started to get a random yet increasingly frequent clicking sound under the dash on our 2013 Dodge Grand Caravan.
At first we would notice it when we used the remote to start opening the sliding doors to let the kids in so I assumed it was some relay spazing in the body control module or something.

After a month or so it started to click more. The wife said it did it when she was driving and she could sometimes hear it when she was not driving but was near the van.

Then i began to investigate and noticed that if I turned the driver side temp control to the coldest setting it would then start clicking and then stop when I turned it above the coldest setting.
This stopped it from doing the clicking when driving but still did it when we opened the door etc.

I took apart the panels under the dash and realized it was the driver side temp control actuator/servo/blend (whatever someone wants to call it) unit.
I am not sure why it clicked when we opened the sliding doors but I guess it was something Dodge does to allow air to vent or something.
When I took it apart i did not find anything broken.
When I put it back on it seemed to be ok. Maybe something was cocked or out of time. I may never know but it seems to be ok since I did this a week ago.