4x4 not working when hubs are in auto - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 10-10-2010, 11:18 AM Thread Starter
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4x4 not working when hubs are in auto

When my hubs are in auto and I switch to 4 high or 4 low it does nothing. If I put it in park, switch the hubs to lock then my 4 wheel drive will kick in. Any suggestions on what that might be?

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post #2 of 11 Old 10-10-2010, 11:24 AM
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arent those run off vaccuum?? check lines..

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post #3 of 11 Old 10-10-2010, 11:41 AM
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yes it is ran off vacuum. get a mityvac and check your hub seals and see if it holds vacuum if it does, make sure your vacuum pump/motor is working on pass side fender. If all that works than you have a break in a vacuum line from the vacuum resivoir to your hubs. edit: hub seals are really common too so thats why i said check that first.
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post #4 of 11 Old 11-01-2010, 03:19 PM
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does anyone have a part number for the hub seals?

I called ford they said not serviceable. I have replaced my vac lines so all i can guess is the seals are bad. Bc as soon as you flip the switch wait about 30 sec the defrost switches on get out of 4x4 itll come back to ac

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post #5 of 11 Old 11-04-2010, 08:33 AM
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Mine did the same it was the vacuum solenoid under the hood on the passenger side next to the battery, ill get you a prat number

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post #6 of 11 Old 11-06-2010, 11:50 AM
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Hope this helps.
Attached Files
File Type: pdf AC Climate Controls.pdf (60.6 KB, 102 views)
File Type: pdf ESOF Vacuum.pdf (749.9 KB, 1161 views)
File Type: pdf Vacuum Control Motor Air Inlet Door.pdf (46.3 KB, 102 views)
File Type: pdf Vacuum Control Motor Panel Defrost door.pdf (45.7 KB, 83 views)
File Type: pdf Vacuum Control Motor Panel Floor door.pdf (63.7 KB, 90 views)

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post #7 of 11 Old 11-06-2010, 10:07 PM
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Quote:
Originally Posted by theswoleguy View Post
does anyone have a part number for the hub seals?

I called ford they said not serviceable.
lol, hub seals are definatly replaceable. I dono how many we have done real common thing and no I dont work at a ford dealer. Like I said as long as you have vacuum, vacuum holds all the way to the hub, and no vacuum held at hubs then ya you need hub seals. If it works with hubs engaged then you have a vacuum issue.
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post #8 of 11 Old 11-07-2010, 05:41 PM
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how much vacuum is it supposed to hold? Don't wanna suck the hell out of it, and mess it up... lol

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post #9 of 11 Old 11-22-2010, 07:52 PM
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I have this same problem, and am getting it fixed Monday after Thanksgiving via extended warranty. Not to hijack, but if I lock my hubs in manually, am I in 4-high or will I be in 4-low? Expecting bad snow between now and Monday, so it'd be nice to know. Thanks.
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post #10 of 11 Old 11-22-2010, 11:03 PM
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You can lock the hubs manually but not engage the transfer case. Once you turn the switch into 4 Hi or 4 Lo that is what you will have. Just because you manually lock the hubs doesn't mean you are in 4X4.

2004 F350, Lariat, True Blue/Arizona Beige, CC, LWB, 6.0 PSD, Torqshift, FX4, Camper package, captains chairs, power & heated TT mirrors, adjustable pedals, AIC, dual alternaters, power sliding rear window. C-Betr mirrors, ARE K series cap, Bedrug, BFG MT 285/75r16,overhead DVD player, DPPI turboback dual exhaust, gauges, Husky mudflaps, Weather tech vent visors, and Lund bug deflector. Date ordered 12/23/2003. Delivered 2/5/04
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