What's this do? Broken Vacuum Line

[Mustangnut6788]

Hey guys I was just poking around under my hood today and found this broken vacuum line. It's up near the front passenger side right by the battery and radiator. Anybody knows what this line is for?

Thanks,
Nate

[Clayton1985]

You must hear your pump running constantly?

[Mustangnut6788]

Not really sure? I guess I will have to listen more closely for it. I've only had the truck for about two months now and only have about 300 miles on it. I haven't noticed anything weird. Where is the vacuum pump located?

Edit: I have noticed that my 4x4 hasn't been engaging but the heater controls work.

[jesilvas]

The line must go to your 4wd then.
Can you switch between vent, floor, and defr?

[Mustangnut6788]

Yes I can change the different blower outputs for the ac/heat.

[Clayton1985]

Yeah it's for 4x4 (auto)
I've got my pump disconnected, my heater controls work fine.

[Mustangnut6788]

Cool. I will look into it some more tomorrow and trace the lines and see where they go. Didn't really have time to investigate today, figured somebody on here would probably know.

[Clayton1985]

I broke a line that goes underneath batter/degas bottle tray when I did egr delete, too cold/lazy to fix it so I just unplugged the vacuum pump, and locked hubs in. Need them locked all winter here anyways so no big deal.

[jesilvas]

At least you probably use defrost all the time too.

[Clayton1985]

95% of the time its on the floor/defrost setting, when its really cold I sometimes put it on dash vents and pointed at steering wheel lol.
I thought at first no vacuum would make hvac go to default setting (defrost) like the 6.0 but it doesnt.