That shouldn't affect its functionality at all. Some parts might swell and shrink in the temp change but it shouldn't be anything significant enough to keep it from working.

 

I had a lot of problems with the ESOF on my '06, so when I replaced the truck I kept looking until I found one with manual hubs and the man stick in the cab. You can't miss what you don't have.

 

So after some digging around today i found that the lines are fine no pinches nothing. I tested the vac again this time only i found something to plug the lines with and i found that the vacuum system works fine, it pulls vacuum at the correct value and for the correct amount of time. I also discovered that its the driver side that was leaking because when i connected the lines to the knuckle and tested them again the passenger side wasn't pulling vac do to it leaking through the drivers side somewhere. When i used the vac gauge on the drivers side it worked fine because the passenger side is sealed. I removed the nipples and they were clear and not clogged so it is either my hub or the seal in the wheel on the drivers side. Personally I'm thinking its the hub so I'm going to order new O-ring first and try it out to see if it works, if not i guess my next step is Hubs, then the seals.

 

Nice work isolating the problem!

 

Glad to see your finally able to trace down the problem. If the new o-ring does not solve the problem, you can always swap hubs, driver to passanger and passanger to driver to see if the leak follows the hub. Or block off the passenger side vacuum line and use the passenger hub on the drivers side and see if the seals hold vacuum. To bad we don't have any of those "special tools" that Ford has to test the various parts. Keep us posted.

 

Funny you should mention that. There is a new user by the name of Specialtools that is in Texas. He has a large inventory of Ford special tools from a closed dealership. He is offering them to FTE folks at good prices. Send him a note if there is something particular you are looking for.

I found out about him through another FTE user, Nicmike, who bought pallet loads of manuals and electrical diagrams from Specialtools. Nicmike has been selling the manuals to FTE users at a deep discount from the eBay prices.

Here is the link to the thread that started all of this -
https://www.ford-trucks.com/forums/1...-diagrams.html

 

!!! ill have to shoot him a PM lol any tools i should look into? i know there's a hub testing tool. I just returned the vacuum gauge because i only had it for 2 weeks but I'm pretty sure its the drivers side hub i could also plug the hose on the passenger side and see if the drivers side engages or not and vise versa.

 

You might want to invest in a MightyVac (or equivalent) type of tool. The hand pump can pull a vacuum and there is a built in guage. It can also pressurize. Its not a tool you will use every day though. But I did use it on my outboard lower end to find the leaking seal.

Plug one end of the hose and pressure and vacuum test hoses. Used it on my ESOF. Used it on the knuckle. Thats how I know I have a slow leak. Pumped up a vacuum and wached the gauge. I haven't tried it yet, but I am sure you can use it to engage and disengage each front wheel.

 

I had rented one from auto zone but unfortunately the hose that came with it was too big for the nipple and i didn't have one small enough lying around. I was going to buy one once they get more ins stock though.

 

Ray aka Specialtools
Did have the hub kit at one point because I saw it in the listing I got.
Here is an 04 hub survice
2004 F250 ESOF Hub Service
On the hubs not working when it cold out that is do to the wrong grease or
old stiff grease. So no mater what the cause you need to clean it out and
re-grease with the right grease.

But first you NEED to look at this price from Tousley Ford Parts Depot
lock assy 4WD, automatic hub Left
MSRP $202.63 Core ?$0.00 Online Price $133.74
2006 FORD F-350 SUPER DUTY Parts - Tousley Ford Parts Depot

$133.74 is a very good price vs the $500.00 I saw somewhere.
Mind the fact that I did the lookup on my 06


Sean

 

Maybe my 08 just needs to be taken apart, cleaned and re-greased ....

 

find it strange that almost all of the ESOf stuff sucks from Ford, yet 100% of the new trucks on the dealerships have that option, including the XL work trucks..... I'm thinking because of the money Ford makes on fixing them all the time LOL

 

LOL probably true.

 

Thinking you have the solid front axle, you can bet the problem is the inner wheel seal on the hubs, You stated you had extensive work done on this area. I would bet those inner seals are damaged if they were replaced or shot if not. These things require special tools and a lot of care to install properly.

The best way to test this is using a hand vacuum pump and see if you can pull a vacuum on the line running down to the axle. It should be easy to do if all is ok down there. Check all the lines but then, no vacuum? Forget the seals and go manual.

By the way, Warn hubs do have their issue also.

 

What issues do the warns have? i do not have any of the tools to do the job so unfortunately id need to get that done by a mechanic or buy some tools . I am going to try new hub seals since they are cheap and if i still have no luck then I'm going to look into how hard it is to replace the seals and then the hubs. I might go my Stroppebaja's tech articles and do my rakes etc while I'm at it as well...this is why i might have a mechanic do it because i will go overboard with new shiny parts lol.