4wd Vacuum Solinoid
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More Turbo
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4wd Vacuum Solinoid
My front hubs will not lock when turned to auto. I’ve checked fuses. I have vacuum. I am suspecting it is the vacuum solinoid. Anyone know where the solinoid is located on the 2017 super duty?
Hotshot
Joined: Oct 2006
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From: Texas
If it is too cold, the grease is too stiff to allow movement of parts inside hub.
Hotshot
Joined: Oct 2006
Posts: 10,151
Likes: 7,978
From: Texas
OK. That *should* eliminate cold temp issues. I never really had issues until below zero. Was just a thought since it is that time of year in a lot of places.
Of course, that is the beauty of the Ford hubs, if you even *think* you are going to need 4WD you can turn the hubs to LOCK and just drive, switching to 4H as needed, and back to 2H when not needed until you get the issue resolved. Can’t help on location of any relays or solonoids.
Of course, that is the beauty of the Ford hubs, if you even *think* you are going to need 4WD you can turn the hubs to LOCK and just drive, switching to 4H as needed, and back to 2H when not needed until you get the issue resolved. Can’t help on location of any relays or solonoids.
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Joined: Aug 2017
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From: Chicago Suburbs
Do you have vacuum at the hubs? If so, I would say your solenoid is working fine and you need to look into the hubs, but it would be surprising that a mechanical issue in the hub would affect both identically.
The hubs lock when vacuum is applied and unlock when vacuum is gone. Both hubs share the same "plenum" so any leak on the hub side of the solenoid will cause both hubs to not lock. It is super common for the vacuum lines to just fall off the hubs.
The hubs lock when vacuum is applied and unlock when vacuum is gone. Both hubs share the same "plenum" so any leak on the hub side of the solenoid will cause both hubs to not lock. It is super common for the vacuum lines to just fall off the hubs.
Laughing Gas
Joined: Dec 2019
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From: MA
If you have vacuum why suspect the solenoid ?
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From: Northwest
Hobo
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I've got vacuum at the pump.... no vacuum at the hubs.
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If that's the case.... Bypass the solenoid and connect "hose to hose" and see if the 4 wheel drive works.
Hobo
Hobo
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Found it. Thanks. Turns out the solenoid valve is working ..... vacuum passes through when selector is set to 4H and not when set to 2H. No vacuum at hubs. It's not a hub seal leaking because I can unhook the left side or right side and find no vacuum on either side. I think it has to be a leaking line although I can follow all the lines and there is nothing obvious...... everything looks new. Anyway thanks for your help.
Laughing Gas
Joined: Dec 2019
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From: MA
Found it. Thanks. Turns out the solenoid valve is working ..... vacuum passes through when selector is set to 4H and not when set to 2H. No vacuum at hubs. It's not a hub seal leaking because I can unhook the left side or right side and find no vacuum on either side. I think it has to be a leaking line although I can follow all the lines and there is nothing obvious...... everything looks new. Anyway thanks for your help.
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