and where does it go.

 

Goes right where it is. It's the vent for the vacuum system of the front axle disconnect.

 

I had no idea what that was lol

 

Yer in Florida Stud. I suppose y'all must have short handles.

 

thanks again

 

Nope, not a vent line. It's definitely a vacuum line check valve though.


OP,
Always provide more info when asking a question. Year, and engine size at the very least.

You might find more info here
https://www.google.com/search?q=cher...w=1203&bih=617

 

An 88 with Command-Track and a Vac disco definitely has a blue vent line. Maybe it has to do with letting the air in to the other side of he diaphram as it moves. It's positively actuated both directions. (no vent down there)