some type of vacuum pump?? help needed

[Rebel-Offroad]

ive been noticing the sound coming from this is getting louder, i'm wondering what it is? appears to be some type of vacuum pump? this is my first diesel so im not too aware of all of the parts on this thing. What is it? Just trying to fugure out what is going on here. any help would be greatly appreciated
thanks!

[ju015dd]

Yeap that is your vacuum pump. Are you having any issues with your air just blowing out of the defrost or any 4x4 issues?

[Rebel-Offroad]

automatic 4x4 issues so i have to lock hubs manualy, and havnt really had the air on anything but defrost. i will see if it makes a difference if i put it on a different setting

[Rebel-Offroad]

checked and air only blows through defrost, new pump i should be all set correct?
Thanks

[jc82chevyman]

well you may not need a pump most likely the problem is just a vacuum leak, when mine runs non stop I just wiggle the fittings and check for leaks and all is well for 3 months or so then do repeat

[Rebel-Offroad]

well i think its own to the seals in the hubs making the pump run continuously. anybody know how much vacuum i should be able to hold from the hose at the hubs?

[EArmsF350]

Your vaccum pump will not run non-stop because your hub seals are shot. You do have a vaccum leak if your vent selector stays on defrost all of the time though. We have that established. Do make sure you have a good connection and no burnt wires on your vaccum pump. Check all of your vaccum lines for dry rot or broken fittings or even disconnected fittings. Just do the process of elimination.