Vacuum hose, another dumb question

ideologist

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Where does this little black hose go inside the ca? It is hooked up to the two-pronged vacuum fitting on the intake manifold. Larger hose goes to a brake booster? Not sure where the little one goes, I can't follow it without dismantling most of the dash apparently

Thanks for any guidance!

20200830_025812.jpg
 

halifaxhops

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By chance you have a factory Vacuum gauge? Never seen them on the drivers side usually the pass side for heating/ac controls.
 

ideologist

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By chance you have a factory Vacuum gauge? Never seen them on the drivers side usually the pass side for heating/ac controls.

I don't! I bought one to install, and was going to T off of whatever this is.

My car is a factory bench seat with a column shifter, was going to find a way to mount it upside down under the dash because I thought it was nifty
 

cbarge

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Vacuum feed for push button heater controls.
The majority of slabs do have this hose going through firewall as shown in posted pic.
Hope this helps
 

70bigblockdodge

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Is it for parking brake release when you take it out of park?
Or heater controls sice they are drivers side center.
 

notsosan

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Could be for a trunk release. Does your trunk latch have a little vacuum diaphragm and is there a button in your glove box? My 66 300 has one.
 

ideologist

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Could be for a trunk release. Does your trunk latch have a little vacuum diaphragm and is there a button in your glove box? My 66 300 has one.

I don't have the trunk release button. Based on where it goes through the firewall, it's probably the heater controls. I never fathomed those buttons used vacuum
 
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