4x4 auot hubs
Elder User
Joined: Sep 2004
Posts: 851
Likes: 0
From: N. Georgia
If it doesn't default to defrost when you switch it to 4wd it shouldn't be a vacuum leak. It defaults to defrost because it tries to send the vacuum to the hubs and it bleeds it from the air controls. No default usually means no vacuum leak. Now on to the dash lights. The lights show the position of the transfer case not the hubs. While the switch on the dash does tell the PVH to send the vacuum pulse to the hubs and tells the transfer case to shift, the dash lights just tell you the transfer case position. The transfer case is electrically operated and really has nothing to do with the vacuum hubs other than they operate by the same dash switch. Do I have everyone totally confused now?
Joe
p.s. To the OP: I have no idea, nor does it make sense to me, that your dash lights wouldn't work with the hubs in auto but then work when you lock the hubs in manually. The transfer case should shift into 4wd (and thus the lights should light) whether the hubs ever lock in or not. I'm sorry I couldn't be of more help to you.
Joe
p.s. To the OP: I have no idea, nor does it make sense to me, that your dash lights wouldn't work with the hubs in auto but then work when you lock the hubs in manually. The transfer case should shift into 4wd (and thus the lights should light) whether the hubs ever lock in or not. I'm sorry I couldn't be of more help to you.
Last edited by JOE-M; Dec 16, 2007 at 09:04 PM.
Thread Starter
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Elder User
Joined: Dec 2006
Posts: 715
Likes: 0
From: germantown, WI
alrite well after further review i was driving my truck home tonite and tried the ac trick again and after driving for about 10 seconds it did switch over to defrost.. so i do have a vacuum leak and now im gunna order the hoses from dieselsite.. thanks for all the resposes cant get enuf of this site with all the great people out there lookin to help a fellow ford boy
Not a liberal...
Joined: Jul 2006
Posts: 6,635
Likes: 4
From: Cut & Shoot, Texas
Before I ordered hoses I would disconnect the hoses and pinch them off one side at a time and try to pinpoint if it really is the hoses. It's very possible that your vacuum leak could be inside the hubs themselves in which case new hoses will not help.
Elder User
Joined: Sep 2004
Posts: 851
Likes: 0
From: N. Georgia
It could be the hoses, the PVH, the lines under the dash, the hub seals or all the above. I think Texas Outlaw has the right idea. Do some testing to figure out where the leak really is before you just start replacing parts. Unless you just want the new hoses whether that's what's wrong or not.
Joe
Joe
Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
Originally Posted by Texas Outlaw
Before I ordered hoses I would disconnect the hoses and pinch them off one side at a time and try to pinpoint if it really is the hoses. It's very possible that your vacuum leak could be inside the hubs themselves in which case new hoses will not help.
Senior User
Joined: Feb 2007
Posts: 360
Likes: 1
Could be the knuckle seal, Hub Yellow Oring or the ESOF seals. This is why my truck has manual hubs on it now. TOO MANY things to go wrong. I do miss the luxury of not having to lock the front in "Just in case I need it", but at least I know it's there if I throw the switch to engage the transfer case and the Warns are locked in.Check out Powerstrokeshop.com or a company called Quad4x4.
Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
Thanks for the info. I have the auto locking with manual override, but the auto is so much easier than having to get out to lock them in. Especially when you are deep into mud before you realize you need them.
Still no luck finding any.
Still no luck finding any.
Last edited by ggirten; Dec 17, 2007 at 12:56 PM.
More Turbo
Joined: Oct 2003
Posts: 597
Likes: 22
From: Central Maine
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Senior User
Joined: Feb 2006
Posts: 441
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From: Byron, IL
Can you just turn the hubs we have on our trucks to the lock position if your auto hubs arent working until you can switch over to the warn manual hubs to get you thru the winter so then at least you would have 4 wheel drive if you need it ?
Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Originally Posted by Wieckster
Can you just turn the hubs we have on our trucks to the lock position if your auto hubs arent working until you can switch over to the warn manual hubs to get you thru the winter so then at least you would have 4 wheel drive if you need it ?
Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
Originally Posted by Wieckster
Can you just turn the hubs we have on our trucks to the lock position if your auto hubs arent working until you can switch over to the warn manual hubs to get you thru the winter so then at least you would have 4 wheel drive if you need it ?