HVAC not switching position

[Colin7.3]

As most of you know. our trucks still use vaccum to control the switch as to where the air from our HVAC comes out of in out trucks.

Now mine is not working, i know my vaccum pump is running i hear it when i turn my key on. The vaccum lines i can see look fine under the hood. I cant really see any under the dash.

Has anyone had this problem? What did you do to fix it? It really sucks just having the heat on defrost all the time cause thats where it defaults to.

[ZMANN]

i think yours will be like my 06 you can clean out your glove box and pull down the top with it open and then it will drop past the normal opening


you should see the actuator and when selecting what vent u desire it should move

u can check for vacuum there

[Colin7.3]

thanks!

Ill check that out in a few min. when i head back to the shop

[jsalty]

Did you ever figure out what your problem was?

I am having the same issue, except that AC is blowing through my defrost, too warm for heat this month.

[jesilvas]

The pump should shut off at some point once it reaches desired vacuum.
Defrost only is a leaking vacuum line or bad vacuum pump. Usually. Bet your 4wd hubs don't auto lock in huh?

[jsalty]

I will have to check the hubs.. what's the best way to tell if they are locking?
my winshield squirters stopped working too.. very little bubbles coming out of pass side only.. it all worked two days ago..

[jesilvas]

Maybe those two pumps are on the same fuse?

[jsalty]

Perhaps, do you know what fuse or even what fuse block to look at?


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[jesilvas]

All and both.
Get a meter and check em all. Fast and easy

I made my Samsung SGH-I997 send this.

[Pullnpray]

most likely a disconnected vaccum hose under the hood.