What color vac line is from intake to cluster under glovebox?

[GT_Rich]

There is a junction point under the glovebox of my '92 which has red, white, blue, and black colored vacuum lines. What line is coming from the intake?

During my hide everything and delete heat and a/c last winter, I cut the line going through the firewall, and now I have no vacuum going to my hvac controls. I'd like to at least use the vent again Thanks in advance.

 

[silver87]

if im not mistaken, it is the black one

 

[4G-KDMP]

Black for sure!

 

[jrichker]

Diagram courtesy of Tmoss & Stang&2birds

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring http://www.veryuseful.com/mustang/tech/engine/

Ignition switch wiring
http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel pump, alternator, ignition & A/C wiring
http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

Computer, actuator & sensor wiring
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Fuse panel layout
http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

Vacuum routing
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

 

[GT_Rich]

Thanks everyone, and especially jrichker for that diagram. I even went to his site looking for a diagram like that, and couldn't find it!

Do you think the check valve and reservoir are needed? I was planning on taking a line right off the manifold and going to the black line at the cluster under the glovebox. I could always add the reservoir and valve back in if I had to, but I'd rather not have to find the room for it.

Also, I don't understand the purpose of the cluster I keep talking about. From the diagram, it looks like everything comes from the HVAC controls and goes directly to a component. Why would Ford splice all of them at one point?

 

[jrichker]

Thanks everyone, and especially jrichker for that diagram. I even went to his site looking for a diagram like that, and couldn't find it!

Do you think the check valve and reservoir are needed? I was planning on taking a line right off the manifold and going to the black line at the cluster under the glovebox. I could always add the reservoir and valve back in if I had to, but I'd rather not have to find the room for it.

Also, I don't understand the purpose of the cluster I keep talking about. From the diagram, it looks like everything comes from the HVAC controls and goes directly to a component. Why would Ford splice all of them at one point?

The vacuum reservoir insures that under low vacuum (full throttle) or no vacuum (engine off) that the HVAC controls still operate. Image losing your defrost during a cold night when you want to enjoy the pleasing effects the cold air has on engine performance. Floor the throttle and the defroster quits and the windshield fogs over.

The check valve helps make sure that the vacuum in the reservoir is always higher than the intake manifold. It helps insure that there is plenty of vacuum in the reservoir to operate the HVCAC controls. Without the check valve, anytime the vacuum in the intake manifold dropped below the level of the reservoir, the reservoir would empty out. No vacuum in the reservoir and the HVAC controls quit working until the vacuum builds back up.

The splice that brings all the vacuum lines to one place is probably there to make it easy to disconnect for removal or test the HVAC controls.