Excursion 4x4 not engaging
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Senior User
Joined: Mar 2012
Posts: 301
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From: Nanuet, NY
Excursion 4x4 not engaging
My Excursion is having an issue with the 4x4 system. The. 4x4 selector switch on dash lights up properly for 4x4, but the auto hubs don't actually engage. The hubs will lock only if I manually lock the hubs. I can hear relay click, so I don't think its electrical. The hubs had new o rings installed when I did front ball joints a few thousand miles ago, and the 4x4 worked fine up until today. Any thoughts or ideas of common solutions?
Cargo Master
Joined: Feb 2011
Posts: 3,450
Likes: 13
From: Forest lake minnesota
My Excursion is having an issue with the 4x4 system. The. 4x4 selector switch on dash lights up properly for 4x4, but the auto hubs don't actually engage. The hubs will lock only if I manually lock the hubs. I can hear relay click, so I don't think its electrical. The hubs had new o rings installed when I did front ball joints a few thousand miles ago, and the 4x4 worked fine up until today. Any thoughts or ideas of common solutions?
Lead Driver
Joined: Jan 2008
Posts: 6,180
Likes: 83
From: Georgia
Check the vacuum lines that run to the front hubs(right along beside the brake lines) for holes and degrading of the rubber. Takes a minute to replace each one. Does your vents work ok?? Meaning, when you turn on the defrost and then back to heat and vent, it all changes like it should. Still could be a vacuum leak, but also could be a PVH solenoid on the right front fender.
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Senior User
Joined: Mar 2012
Posts: 301
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From: Nanuet, NY
OK found a hard plastic vacuum hose resting on top of pass side exhaust manifold. It is covered with a plastic cover and all burnt up. Looks like this plastic hose is part of a vacuum line harness. The hose that burnt ultimately connects to vacuum tank. So this was my problem.
Do you have to buy whole hard plastic vacumm harness etc? Looks like part labeled on Fordparts.com as " Locking hub vacuum tube" labeled as 3C124. Wonder if this is the whole entire harness. Anyone change this before?
Do you have to buy whole hard plastic vacumm harness etc? Looks like part labeled on Fordparts.com as " Locking hub vacuum tube" labeled as 3C124. Wonder if this is the whole entire harness. Anyone change this before?
Lead Driver
Joined: Jan 2008
Posts: 6,180
Likes: 83
From: Georgia
If you can find the plastic tubing and a couple of rubber tubes(windshield type tubing) you can repair it yourself until you can get it replaced. lots of friends have had to do this. Get tubing(rubber) just the size it is tight to slide on the plastic tubing and make a patch for the burned section.
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