Question about 2004 Ford F350

15 Answers

4 wheel drive won't disengage

Backed up into a very high snow bank. Put truck into 4X4 low range. got out but won't disengage.

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  • svwestman Jan 19, 2009

    Need to first check vaccum motor. Anyone KNOW where this is???

  • svwestman Jan 19, 2009

    Need to find a diagrom of component location to find vaccum motor or any other 4 wheel drive components before replacing parts. Anyone know where I can find a diagram???

  • svwestman Jan 19, 2009

    Need to know where the vaccum line from the control module is routed. I found a line off at the distribution block on the rear differential, but I can not find where it goes. Anyone out there who can route me correctly??? Thanks

  • svwestman Jan 19, 2009

    Need routing for vaccum line to rear differential 4 wheel drive.

  • svwestman Jan 19, 2009

    Anyone out there know the routing for the vaccum line to the 4 wheel drive control block on the rear differential???

  • svwestman Jan 19, 2009

    I have a vacuum line connected to a block on the rear differential of my F350 with 4 wheel drive. This block has a hydraulic line attached and 2 lines going to the two rear wheels. I need to know where the vacuum line connects to under the truck.

  • svwestman Jan 19, 2009

    Help!!! need to know where vacuum line goes from block that has hydraulic lines connected to it.

  • svwestman Jan 19, 2009

    No help yet!!

  • svwestman Jan 19, 2009

    Where is the transmission fluid pump??

  • svwestman Jan 19, 2009

    Already tried that.

  • svwestman Jan 19, 2009

    I still need to understand how to fix my 4 wheel drive roblem. I can not get it to do anything but stay in low range.

  • svwestman Jan 19, 2009

    I will try that.

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Welcome to Fixya! Try the Old school Method. Have a Partner in the Passenger seat, Drive VERY Slowly Forward and have your Helper Move the Shifter until it Slips Back into Normal. This always worked on My 4x4.

Posted on Jan 19, 2009

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How to Use 4-Wheel Drive in Snow http://www.ehow.com/how_2080994_use-four-wheel-drive-snow.html
just click the link above and check out.

Posted on Jan 19, 2009

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Sounds like its locked up due to cold conditions try to get it inside a garage out of the weather for a couple hours.

Posted on Jan 19, 2009

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Ford puts most of their vacuum hose diagrams on the air filter housing cover.

Posted on Jan 19, 2009

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Have you tried getting the vehicle into a "warm" garage to thaw out? I had the same problem with my 2003 F150 and after it "defrosted" it was fine.

I defrosted it .. Put it into low range. backed up 10 feet, put it back into 2 WD, backed up another 10 feet .. everything was fine.

Posted on Jan 19, 2009

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Hi there
This line may well connect to the transmission fluid pump

Good luck

Posted on Jan 19, 2009

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Sir

Check these links for the diagram

Link 1

Link 2

Thanks
Good Luck

Posted on Jan 19, 2009

  • Asfiya Ahamed
    Asfiya Ahamed Jan 20, 2009

    Sir,

    Click this link and read the passage "Limiting slippage"



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 It sounds like your hubs are bad and the only �fix� is to replace them.  Unfortunately, the only hubs that will work with your 4-wheel drive system are the factory automatic units, which we have found to be high maintenance components.
also tyry this  :----------  Disconnect the front driveshaft.------------
---------. For a manual 4 wheel drive, turn the hub lock counter-clockwise. The knob is located in the center of the wheel. Make sure shift stick is not in the 4X4 position.

Posted on Jan 19, 2009

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Do you have manual hub locks or both?

If you do try to disengage them at the wheels otherwise you will need to check the hublock themselves for dammage.

Posted on Jan 19, 2009

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If it it push button 4WD you need to make sure the wiring to the transfer case was not damaged by the snow. If it manual shifting 4WD, please check there is no snow or ice lodged in the linkage. Other than that you may have suffered internal transfer case damage.

Posted on Jan 19, 2009

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Most of the time it’s a fuse, PVH,(Pulse Vacuum Hublock) vacuum line or vacuum pump.

Posted on Jan 19, 2009

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  • Randy Hough
    Randy Hough Jan 19, 2009


    ESOF 4WD TroubleshootingIt is easier to troubleshoot the system if you have a “Mityvac” vacuum pump. Turn the ignition switch to run (you don’t have to start the truck) and the air controls to vent and the fan control to low. If the truck’s vacuum pump comes on wait until it stops running before each test (open the hood and you’ll hear it better). First you need to remove both lines (left and right vacuum lines) from the hubs. Plug the passenger’s side line and attach the vacuum pump to the driver’s side line. Switch the dash controller to 4WD high. The vacuum gauge should go to 10 in.-Hg. or higher. (It should hold the vacuum at 10 in.-Hg. or higher for 45 seconds on engage and 15 seconds on disengage.) Repeat the test plugging the drivers side and testing the passengers side. If you have the right amount of steady vacuum the problem is probably in the hubs. If you do not have the right amount of vacuum or it is bleeding off, plug the lines back on the hubs and go to the next step. Second remove the vacuum lines from the PVH (Pulse Vacuum Hublock). This is the solenoid located on the passenger side fender well behind the battery and in front of the vacuum pump. Plug the vacuum tester into the lower hose and wait for the vacuum pump to build back up and shut off. The vacuum gauge should read and hold steady at 10 in.-Hg. or more. If it does, the vacuum reservoir should be fine and not leaking, so go on to the next step. Third, plug the bottom line back to the bottom of the solenoid and hook the vacuum gauge to the top barb of the solenoid (not the vacuum line but to the solenoid itself). Try switching between 2WD and 4WD again. The gauge should read 10 in.-Hg. for 45 seconds on engage and for 15 seconds on disengage. If it doesn’t it is probably the solenoid (PVH) on the fender that needs replacing. This was my problem so this was as far as I have gone. If all these things check out, THEN you need to go to the hubs and check them for leaks with the vacuum tester. Most of the time it’s a fuse, PVH, vacuum line or vacuum pump and not the hubs.

  • Randy Hough
    Randy Hough Jan 19, 2009

    Does your ac/heater work properly when you switch modes (IE linger before going in?) or sometimes stay on defrost? These trucks have a vacumn pump that controls it and the auto hubs.If the vacuum pump or hose,fails those are easy to see symptoms.



  • Randy Hough
    Randy Hough Jan 19, 2009

    This will do it.



    Just to cover all the bases.(I started with the obvious)



    If it is in 4 low you have to shift the tranny into nuetral in order to shift back into 4 high or 2wd.


    If it is locked in 4wd Do this.



    This will get it out of 4WD Run power from the battery to the solenoid to get it back in 2WD.

    (The solenoid located on the passenger side fender well behind the battery and in front of the vacuum pump)

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Hi

Kindly Follow the instructions : Put the truck in neutral, have your foot on the brake, switch it out of 4LO and wait up to 10 seconds or so. If this doesn't work, put it in drive or reverse, move a foot or two, then put it back into neutral and try again. I bet it will work. If you're not in neutral, the drivetrain is still being torqued by the engine. If your foot isn't on the brake, I think it electrically prevents the switch out of 4 LO from happening.

Thanks
Rylee

Posted on Jan 19, 2009

  • Rylee Smith
    Rylee Smith Jan 19, 2009

    If it is stuck in, I might suggest you've got gearbox windup. Jacking up a front wheel might let it come undone.

    If the actuator still sticks, I think there's an override on the transfer case. It has a dial with positions. You'll need a 1/2" Ratchet to work it, I think. I've got an 04 with a lever, but I've freed up the auto 4x4s for contractor buddies before



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The auto hubs work of a vacuum system. There is a control unit under the hood on the fire wall, from there it sends vacuum signals by hoses out to the hubs. These hoses run along side of the brake caliper hoses in the wheelwell. More than likely the problem is either these hoses dry rotted and leak or feel off. The other possible problem is the hub itself. It has o-rings that go bad and cause leaks and won't work. The fix is simple, manual hubs. Ford's auto hubs cost well over $500 a pair and the manual ones from them are also over priced. I have the same truck and put Warn 38826 hubs on. They are the better Warn hubs, but there are many other brands out there. They are very simple, first remove the hub cap. Next take a pair of needle nose pliers and remove the retaining rings around the old hub. Then follow the instructions that come with the new hubs. It's less than a 30 min fix and around $200.

Posted on Jan 19, 2009

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Hi svwestman
It sounds like water has freezed inside shaft.

Posted on Jan 19, 2009

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  • 221 Answers

Your problem is common and is caused by a faulty actuator. Replacing it should get your 4-wheel drive system working again.

Posted on Jan 19, 2009

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Click the link below:---
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http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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-------------
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--------------
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http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

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