Help! What is this line?

[LDO]

Can someone ID this line and where it should be connected?
1985 C10
Has AC
Looks to be some sort of AC vacuum control line or something.
Comes out of firewall and routed towards driver side.

[kwmech]

Goes to the vacuum ball, from the ball it goes to manifold vacuum with a check valve. That vacuum lines goes inside to the heater and AC controller for the hvac doors. Should be going not too far from where it is at the moment. The ball mounts to the evap box. I can see the feed line to the ball just below your thumb with the check valve

[LDO]

Originally Posted by kwmech

Goes to the vacuum ball, from the ball it goes to manifold vacuum with a check valve. That vacuum lines goes inside to the heater and AC controller for the hvac doors. Should be going not too far from where it is at the moment. The ball mounts to the evap box. I can see the feed line to the ball just below your thumb with the check valve

Thank you!!

So if I were to get a new 'T' or something, Could I connect it somewhere in the red circle?

[kwmech]

Where's your vacuum reservoir? That's where it's supposed to go, but yeah you can, but as soon as you shut the engine off nothing inside will operate vacuum wise

[LDO]

Originally Posted by kwmech

Where's your vacuum reservoir? That's where it's supposed to go, but yeah you can, but as soon as you shut the engine off nothing inside will operate vacuum wise

I will look today. I sold this truck a few years ago and just recently bought it back so I'll take a look.

[87chevy.com]

if you dont use a vacuum reservoir, it will be like my truck...., full throttle, a/c goes to floor one day I will put a reservoir in there

[kwmech]

Originally Posted by 87chevy.com

if you dont use a vacuum reservoir, it will be like my truck...., full throttle, a/c goes to floor one day I will put a reservoir in there

Yep, there is that also that slipped from my mind

[Dead Parrot]

Bottom of a vacuum pot where the line goes. 2nd larger line goes to a manifold vacuum source. This one is next to the AC housing on the firewall. Some are spherical.

[TKCR]

Pics should help

[LDO]

Thanks for everyone's help. I started digging around and found the T-connection where this is supposed to be hooked up to. Comes from the vacuum reservoir right behind my jack on Driver's side fender.