vacuum questions
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Junior User
Joined: Nov 2012
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vacuum questions
Hey guys I noticed over the winter that my auto locking hubs wouldn't work and I had to manually lock them in. Not a big deal. But in winter I always keep my try truck on defrost and now that's it's getting hot no matter where I turn the **** it stays on defrost. Is this a related problem? Where should I look for vacuum lines to check? Or is it just a vacuum pump?
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
They are almost definitely related. The hubs have a yellow seal in them that can go bad and cause the exact symptoms that you are describing. Here is some good reading on the subject of the vacuum pump. It will help you diagnose.
https://www.ford-trucks.com/forums/1...cuum-pump.html
Here is a link to Guzzle's maintenance of the hubs themselves. It will give you a great idea what the innards of the ESOF hubs are all about. If they are the problem, you can replace some of the parts and be back up to spec.
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
https://www.ford-trucks.com/forums/1...cuum-pump.html
Here is a link to Guzzle's maintenance of the hubs themselves. It will give you a great idea what the innards of the ESOF hubs are all about. If they are the problem, you can replace some of the parts and be back up to spec.
Welcome to guzzle's 4x4 Autolock Hub Lubrication Maintenance Web Page
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
...or it can just be cracked vacuum lines. My ESOF was easy to fix - lube hubs, fix bad vacuum lines, and replace the control solenoid... valve... what ever that thing on the passenger fender is called.
More Turbo
Joined: Mar 2006
Posts: 582
Likes: 2
From: Eads, TN
Check each vacuum line going to each hub. You can disconnect them at the frame and use a vacuum hand pump to test each line. I would start there first. Over time these vacuum lines will deteriorate and cause a leak.
In the past I've also had issues with the axle knuckle seals leaking. I've replaced those as well.
Look at this vid:
In the past I've also had issues with the axle knuckle seals leaking. I've replaced those as well.
Look at this vid:
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Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Pull the line off your pump and hold a finger or thumb over the end. The pump should stop almost immediately. Then work your way through it one piece at a time. It's not as hard as it seems.
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