Found this vacuum hose hanging out under my dash

[Foxy 83.5]

[ATTACH]134642[/ATTACH
Where does it attach?
1983 Mustang GT, 5.0, 5 speed, Factory AC
Thanks!

[87gtVIC]

Something with the HVAC for sure. Blend door actuator maybe?

[KevinK]

I believe there are only 3 vacuum hoses under the dash.
Main vacuum in comes thru the firewall.
Vacuum motor above the gas pedal
Vacuum motor behind the glove box.

[Foxy 83.5]

Thank guys for the input. I’m stumped. Spend a couple hours looking under the dash but couldn’t find where it would connect. I know it doesn’t go behind the HVAC controls because I pulled it out and it has a manifold plug with no spot for a single hose. I checked the blend door and it looked to still have one hooked up (see picture). I know it had a heater core replacement years ago. Could they have left it dangling and just ran another one?

[RED 78']

The color tells you where it goes. It looks yellow to me.
See the diagram that is here.
http://myzephyrs.com/fz_ac_diagrams.pdf

[Foxy 83.5]

Thank you Red ‘78! Your diagram was just what I needed. I’ll crawl under again. It’s definitely yellow striped so I’ll be hunting for the elusive ac-defrost door.

[KevinK]

Actually, the above posted diagrams may not be correct for Mustang. Mustang has only 2 vacuum motors and a cable for the blend door. One vacuum motor has 1 yellow hose and the other has a blue and red hose. Black hose is the main feed from the engine.

Look above the gas pedal and you will see where the yellow hose goes.

Correction: There is a third vacuum motor for the outside recirculate door (white). This only functions with Max and OFF functions.

[Foxy 83.5]

Thanks KevinK. You nailed it! It went to the vacuum motor above the gas pedal. Much appreciated my brother!

[mustangwolf]

I believe there are only 3 vacuum hoses under the dash.
Main vacuum in comes thru the firewall.
Vacuum motor above the gas pedal
Vacuum motor behind the glove box.

Do the non/ac cars have any? I can't see a vacuum line going under the dash on my non AC '83.

[KevinK]

None that I know of.