VAC PUMP REPLACEMENT - 4x4 issues - Ford Powerstroke Diesel Forum
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Old 12-30-2013, 11:54 AM
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VAC PUMP REPLACEMENT - 4x4 issues

So my shift on the fly 4x4 stopped working, the light on the dash wouldn't come on. So I locked my front hubs by hand for awhile when needed then that didn't work to engage my 4x4 at all. So I took it to the dealership, and he says I need a new Vac pump ($443.78 Can). But my heater/blower and all vent settings work fine. I have to wait for the parts to come in, but in the meantime they must have done something, because now my light will come on in the dash although the SOTF doesn't engage but when I lock the hubs manually they now engage? Whats gives? I feel like I'm getting soaked for the Vac pump when it's likely something else much easier and cheaper?? Any advice or words of experience would help!

Thanks!
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Old 12-30-2013, 04:12 PM
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Trace the line to the pump.

Pull it off and use a hand vac pump and see if it works.

They might be charging the full price as it comes with pump and lines.

My point..
The kits comes with the lines and you might have a crack or hole in one and they are lazy and will fix the lines and not replace the pump and bank roll the pump for their own use.


The mech has to follow procedure and if it says use kit that cost 443 to replace just a line they do it.
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Old 12-30-2013, 04:15 PM
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Also take the electrical connector and clean it with some cleaner. I use brake cleaner as I'm little lazy.

Let it dry and clean the contacts if possible or spray some cleaner in there as well.

You could have a dirty connector since it works sometimes.

Radio shack sales electrical connector cleaner and put some die-electric grease to ensure a good seal to keep crAp out.

Good luck and I hope I offered you some hope in saving you a few bones!
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Old 12-30-2013, 04:16 PM
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the bummer here is the dash light indicating 4x4 have nothing to do with the vacuum pump or hubs

only the transfer case shift motor and pcm
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Old 12-30-2013, 07:47 PM
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Thanks very much for the info guys. I'll try the tips above!
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