ESOF - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 10-23-2013, 10:59 PM Thread Starter
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ESOF

2008 f450 hubs not locking in auto. Light comes on. Transfer case engages. I do not have an issue with the defrost coming on. Vacuum pump comes on as soon as I switch to 4 wheel and does not shut off. Brand new selinoid installed by the battery. Where do I look now?? What could be the issue?
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post #2 of 12 Old 10-23-2013, 11:13 PM
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It's a vacuum leak... Here is a link to help diagnose the ESOF

http://www.powerstroke.org/forum/att...-work-esof.pdf

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post #3 of 12 Old 10-24-2013, 07:54 AM Thread Starter
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Even though I am not having issues with my defrost?
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post #4 of 12 Old 10-24-2013, 08:10 AM
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The leak is probably after the solenoid. Even with the leak, there might still be enough vacuum at the top of the system to run your defrost. It's not an extensive vacuum system, so hopefully it's not too tough to track down.

I was having issue with my ESOF a while back too. Turns out one of the vacuum lines came unplugged at the back of the hub. Easy fix.
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post #5 of 12 Old 10-24-2013, 08:33 AM
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I believe all the climate controls use electronic blend dampers now, & no vacuum. If your Vacuum pump only runs continuously after you switch to fwd, then it must be as the OP says in the previous post. Check the plastic vacuum lines that run to each hub.

Here is a link to another thread with a write up on the whole system, Post#2, good info
4x4 engagement question - PowerStrokeNation : Ford Powerstroke Diesel Forum

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post #6 of 12 Old 10-24-2013, 06:10 PM
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Like others said...vacuum leak.

Ive got my pump unplugged as Im too lazy to find and fix my leak. Has no effect on HVAC.

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post #7 of 12 Old 10-24-2013, 07:22 PM
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Hey guys. Mine does the same thing but I think my hvac is different then you lariat and king ranch guys. I got manual hvac not electronic. My defrost works fine, think it's still a leak somewhere? It's for sure been like this since 20k miles and has 37k now.

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post #8 of 12 Old 10-24-2013, 07:59 PM
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The hubs can be taking apart and the O-rings replaced. If it's not the vacuum lines then 9 times out of 10 it's just a O-ring or seal.

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post #9 of 12 Old 10-25-2013, 06:56 PM
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When it happened to me the dealer replaced the solenoid then the hubs...

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post #10 of 12 Old 10-27-2013, 09:30 AM Thread Starter
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ok so i traced my leak to the hub itself. Where should I start. What inside there can go bad causing the leak and how do you fix it?
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