I'm back after the $4000 problem i had a couple weeks ago! Yay me....
 

Ok so the problem now, thank the lord, isn't as bad, but kind of a pain in the butt problem.

My auto hubs aren't working properly. When turned to the auto position and turning the switch to 4-hi, the light comes on, and I can hear the click from the transfer case, but the truck is still in 2 wheel drive.

The only way to engage the 4x4 is to get out and turn the hubs to the lock position. This was a pain because I was stuck in about a foot of mud on a strip job. Had to get out and dig the hub out from under the mud to lock it in...

Also I don't know if this is related in any way, but my A/C only blows out of the defrost vents. It comes out cold, but will not blow where it needs to.

Thanks in advanced!

There was a thread a week or so ago on it... You have a vacuum leak. Check the hoses going to the hubs, they tend to get dry rotted and crack... I picked up a hand vacuum pump from harbor freight and tested the each line individually... If all the hoses are good then you have a bad seal on the hub.

i know this is going to sound completely uneducated, but well i am :p

when you say hoses what do you mean? where would i look for these hoses at and how do they tie into the A/C?

There little "tubes" of probably quarter inch in diameter. There black. Look on the passenger side of the motor compartment.


Strokin' Away

On the passenger side under hood behind battery there is a tank that hold your vacuum pressure. Disconnect one of the lines with the key on and make sure the pump is working ( you will here it) then the lines connect into the hub assembly behind the wheel (they come down from the frame... You will see them and were they connect( not the abs or brake lines) I'll see if I can find the video

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Actually I forgot mike made it into a sticky at the top of the page. Auto hubs not working.

If you put your blower on ( not on defrost) then put it in 4x4 hi and wait to see if it goes to defrost, then you have a bad line some where

Just watch the video it's pretty good

How To: Find and Diagnose ESOF Hub Vacuum Leaks - YouTube
this ought to help

Mine did that. I would just get out and lock the hubs if I thought I was going to need it.

thanks a bunch! will be getting out before getting stuck next time. just wasnt thinking haha was kinda under the influence a little bit playing around in the hills..

Yeah, watch the vid Bob posted...

Why didn't it embed Bob?

It's quite possible something was left off during the last reassembly of everything too.

But with just turbo and computer problems would there have been a reason to disconnect anything related to the vacuum thing??