Not sure if anyone has experience with the little vacuum diaphragm actuator on top of the blower box housing on the B350s, but I just have a ton of a general question.

The actuator has two vacuum ports. One goes through the firewall. On my van the other line is severed and I'm not sure if it actually connects to anything or if it's for testing vacuum.

I notice a lot of these for other vehicles only have a single port, so maybe the severed line doesn't connect to anything?

Anyone able to check theirs and see where it goes. It's the Grey vacuum line on the far passanger side of the van. Thanks!