Help Identifying a line

[Reganburba]

Hello, I was cleaning deposits out of my head this week and noticed a hard line that is melted on one end and open on the other. The red line comes from a check valve. It seems to be the only open line I can find on the car. Everything is oem with nothing removed. I ordered a service manual and identified the line in the diagram under the hood. However, I cant physically find the other leads in the bay to replace it so maybe Im wrong.

1985 Country Squire

[DerekTheGreat]

Oh wow, look, CFI!

We need to know the year and model. But there should be a vacuum line diagram on the hood, core support or fan shroud somewhere. I'd start there. Been a looong time since I laid hands on a CFI car, but that doesn't look fac-tree.

[Reganburba]

Vehicle info updated in first post, thanks.

[Reganburba]

I do have the diagram, I found what the line is, but can't seem to find where its supposed to go in the engine bay

[FordMan77]

Without looking at my 84, I'm wondering if it doesn't lead to the cruise control canister? It's been a minute since I've looked tho.

[kishy]

Uh, alright. Best effort here, not 100% confident:

The red coming into the blue cylinder is the supply from the vacuum tree at the back of the intake.
The blue thing I believe is a check valve.
Where the red transitions to black and the black doubles back (melted one by your thumb), I believe is the supply to the thermactor air diverter solenoid located on the passenger fender liner. This line runs back behind the engine and therefore it makes sense that it could get melted.
The other red is the supply to the throttle kicker/dashpot/fast idle unloader solenoid which we can see in the photo. That solenoid's output lines then go to both the fast idle unloader (looks like a choke pull-off on passenger side of throttle body) and the vacuum operated throttle modulator or dashpot, located on the driver side of the throttle body, which we see to the left of your thumb.

The broken black line by your pinky finger, I am not sure, but I'd suspect it would be the vacuum source for another one of the solenoids which mount on the valve cover - there is a pack of 4 of them, the middle 2 are one assembly. The pair of 2 together are EGR Control and EGR Vent, which together control the EGR valve. It is generally beneficial to keep this working. The other two, one is for the throttle kicker as described above, and the other operates the heat riser valve which is a butterfly valve at the back of the driver side exhaust manifold.

edit: fair chance that mystery broken one might run over to the small vacuum reservoir on the driver fender liner. the emissions control systems are behind a check valve and do have a small reservoir (not the big coffee can one, a small plastic one) so they still work in low vacuum conditions.

I did this from memory combined with looking at this photo of my 84 VECI sticker, which as you can see is damaged right where it deals with the unknown line.

[87GrandMarq]

Looking at pics of my old 85, which of course I have none from the drivers side of the engine bay, if it’s not what anyone else says it might be the line that goes around the cfi unit to the choke pull off.