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4x4 Wont work

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Old Mar 6, 2011 | 04:12 PM
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4x4 Wont work
I have a 2003 F350 with the 6.0L. I engage the 4wheel drive and it doesnt turn the front wheels over. I know the transfer case IS engaging but its not turning the front wheels...Whats wrong?
 
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Old Mar 6, 2011 | 05:02 PM
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do the ac vents go to defrost?
 
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Old Mar 6, 2011 | 06:45 PM
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umm I dont understand. How would I know that and what does that mean?
 
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Old Mar 6, 2011 | 07:33 PM
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Dumb question but are you engaging the 4WD while moving or sitting still?
 
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Old Mar 6, 2011 | 07:37 PM
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I have tried it both ways...and still the front tires wont spin over
 
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Old Mar 6, 2011 | 07:42 PM
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if you have a vacuum leak vents default to defrost if so try the vacuum 4x4 solenoid passenger fender white cap two bolts
 
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Old Mar 6, 2011 | 07:47 PM
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So if I can blow A/C through my front vents, then Im good on the vacuum leak right?
 
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Old Mar 6, 2011 | 07:58 PM
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can you hear the vacuum pump turning on and off when you try this?
 
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Old Mar 6, 2011 | 08:06 PM
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yes i can hear it
 
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Old Mar 6, 2011 | 08:13 PM
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possible leak im not a pro at this just trying to help we have 4 trucks and that was the fix on 3 of them
 
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Old Mar 6, 2011 | 08:33 PM
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my truck has auto and manul hubs. i can always turn them in manually if auto dont work [vacum pump]. you probably just needs to grease the hubs.
 
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Old Mar 6, 2011 | 08:38 PM
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hmmm I guess I will try that. I havent tried switching the hubs from "auto" to "lock"...
 
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Old Mar 6, 2011 | 08:44 PM
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check the vacum lines from vacum pump to each side hub for damage. and truck does need to move for the hub to lock in [with the vacum pump]. remember that if your suck and need to light it up to get out[ go easy till it locks in] then light em up. make shure the hubs are turned the same both auto or both lock
 
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Old Mar 6, 2011 | 08:51 PM
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ok...thank you I will check as soon as i get some daylight
 
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Old Mar 7, 2011 | 10:03 PM
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There is a module on passenger side fender, had same problem and changed no problem. Service manager gave me a heads up and he was right, may have part # it makes a vacumn I guess.
 
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