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Old 08-15-2010, 11:08 AM   #1 (permalink)
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Question 06 f250 4x4 auto locks wont work?

Hey yall, I did a quick search but no luck, I have a 06 ford f250 4x4 with the auto hub locks. when I engage the switch the lights will come on but will not engage the front diff, I can manually lock the hubs and they work fine, Is this a sensor or I have heard "o"rings, Thanks for any info...
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Old 08-15-2010, 12:28 PM   #2 (permalink)
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Does your AC blow out your defroster? Check that and report back.
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Old 08-15-2010, 12:41 PM   #3 (permalink)
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what? ac? have you ever had the front seals serviced?
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Old 08-15-2010, 01:04 PM   #4 (permalink)
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Yeah, the solenoid that controls the vacuum going to the auto hubs also controls the AC vac controls. So if one goes out.. the other will too.
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Old 08-15-2010, 01:54 PM   #5 (permalink)
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Quote:
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Yeah, the solenoid that controls the vacuum going to the auto hubs also uses the same source as the AC vac controls. So if one goes out.. the other will too.
fixed it for ya..

he is asking you that to see if you have source vacuum, the a/c defaults to defrost and the vacuum pump is a common failure point, so is the solenoid, so are the seals...
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Old 08-15-2010, 01:55 PM   #6 (permalink)
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A/C blows good and where its supposed to, I have not6 had the hubs serviced, I just bought this truck and have a few bugs to work out
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Old 08-15-2010, 02:05 PM   #7 (permalink)
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Quote:
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fixed it for ya..

he is asking you that to see if you have source vacuum, the a/c defaults to defrost and the vacuum pump is a common failure point, so is the solenoid, so are the seals...
There you go!

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A/C blows good and where its supposed to, I have not6 had the hubs serviced, I just bought this truck and have a few bugs to work out
Sounds like you're having the same problem I chase every winter on my '04. I know that solenoid going out is the most common problem. It happened on my Dad's '07 at about 19k miles.

I've cleaned and rebuilt my hubs with new o-rings. Still don't work. So... let me know if you come up with a solution.


FTG.. have any advice?
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Old 08-15-2010, 04:05 PM   #8 (permalink)
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Follow through this link and see if it helps

http://www.guzzle7pt3.com/nblube.php
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Old 08-15-2010, 05:37 PM   #9 (permalink)
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My buddies '02 had a similar problem. his ac didnt work from the time he bought his truck used, but his vacuum lines had dirt clogged in them somehow. He cleared the lines and they started working again... my .02
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Old 08-15-2010, 06:21 PM   #10 (permalink)
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if you have source vacuum and the indicator lamp shows 4x4 it means the system thinks it is working and the t-case has shifted, the solenoid recieves a command from the module and either applies 7" or 14" to unlock or lock the hubs, it works like a ballpoint pen, click it once and it locks, click it again and it unlocks, difference is it gets 7" to unlock and 14" to lock. the solenoid has to deliver the right amount of vacuum and the hubs have to hold it, if you have a vacuum gauge or pump, test the vacuum from the solenoid to see if it is working as described, next pull a vacuum on each wheel seperately and see if it holds, it should, common issues are, fitting in knuckle is plugged, vacuum leak inside knuckle, solenoid failure, or external leaks...
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Old 08-15-2010, 08:01 PM   #11 (permalink)
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I see external leaks the most, broken flex lines at the knuckle or a melted line by the RH exhaust manifold. A longer term external leak will also burn up the vacuum pump in time.
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Old 08-15-2010, 08:25 PM   #12 (permalink)
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Warn premium manual locking hubs can save you a lot of headaches from vacuum issues but I don't believe it could be a vacuum issue if you've got air blowing from somewhere other than the defrosters. (as a previous poster mentioned) It's got to be some other type of issue.
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Old 08-15-2010, 10:04 PM   #13 (permalink)
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I've checked for cracked hoses at the knuckles and while I was there I pulled off the lines to check for vac by just listening. I didn't know about the 7# and 14# thing. I'll have to put a gauge on it. Thanks.
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Old 08-15-2010, 10:35 PM   #14 (permalink)
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Around here it is not uncommon to blow up the locking hubs when it is -30C and colder and you rely on the automatic locking portion instead of the manual.

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Warn premium manual locking hubs can save you a lot of headaches from vacuum issues but I don't believe it could be a vacuum issue if you've got air blowing from somewhere other than the defrosters. (as a previous poster mentioned) It's got to be some other type of issue.
Warn does not make lockout hubs for the 05+ SD's with 35 spline outer shafts.
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Old 08-15-2010, 10:53 PM   #15 (permalink)
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That article i posted says its generally the knuckle seal is usually the culprit.
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Old 08-15-2010, 10:57 PM   #16 (permalink)
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That article i posted says its generally the knuckle seal is usually the culprit.
That's the exact article I used while servicing my hubs last winter. As much as I was hoping that was my problem... it wasn't.
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Old 08-15-2010, 11:42 PM   #17 (permalink)
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Unless you REALLY want to keep your auto locking hubs (with their plastic guts), Summit has the Mile Markers on sale for $95, down from $165. Pretty damn good price, I ordered some yesterday. If you do decided to go that route, definitely double check that they work for your 06. There was some discussion about whether or not those hubs fit the 05 and up rigs on one of my Super Duty forums. Don't know if it got answered or not. Just a suggestion.
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Old 08-16-2010, 10:30 AM   #18 (permalink)
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ok first off ford tech guru listen to him everyone else that says their friends buddy's cousin had the same problem and that the solenoid is the most common its not. simply put your seals are a service item and if not installed correctly with a dealer seal driver to will not have auto hubs simply put. being your truck is an 06 they probably havent been done ever because dealers fail to upsell them. get your seals checked. to all the other super duty owners out their with auto hubs. just because you already did the seals does not mean that you did them right. just as the 05+ front ends the 99-04's need the proper depth set as well. its the same post on every 4x4 site out there 40 times a year.
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Old 08-16-2010, 10:31 AM   #19 (permalink)
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pin holes in the vac lines are the 04- present f150's from the rh ex manifold
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Old 08-16-2010, 11:20 AM   #20 (permalink)
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or battery acid
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Old 08-16-2010, 07:35 PM   #21 (permalink)
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As far as I know there are no aftermarket hubs for the 05' and newer Super Duty's Trucks Can someone prove me wrong?? Thought I saw some listed once but can't seem to find them now
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Old 08-16-2010, 08:04 PM   #22 (permalink)
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Quote:
Originally Posted by EODguyJake View Post
Unless you REALLY want to keep your auto locking hubs (with their plastic guts), Summit has the Mile Markers on sale for $95, down from $165. Pretty damn good price, I ordered some yesterday. If you do decided to go that route, definitely double check that they work for your 06. There was some discussion about whether or not those hubs fit the 05 and up rigs on one of my Super Duty forums. Don't know if it got answered or not. Just a suggestion.
The only people that will tell you that the Warn/MM etc. locking hubs for an 04 down will work on a 05 plus (outside of an 05 Excursion) are the ones who have never worked on a 05 plus front axle.
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Old 08-16-2010, 11:19 PM   #23 (permalink)
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The only people that will tell you that the Warn/MM etc. locking hubs for an 04 down will work on a 05 plus (outside of an 05 Excursion) are the ones who have never worked on a 05 plus front axle.
That's why I didn't make the positive statement that they would work for an 06. I kinda remembered there was some discussion about it while I was typing that post, so I made sure to CMA by throwing the "double check" in there. I figured someone in here would see it and clarify. You da man.
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