4wd will not kick in
Thread Starter
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New User
Joined: Apr 2005
Posts: 3
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From: round Rock, TX
4wd will not kick in
Hi folks. I ran a search for my problem but did not really find a solution. Maybe someone here can help. I have a 2001 f-350 7.3 diesel 4wd. When I switch to 4wd with the shift-on-the-fly, the A/C shifts to the defrost and the 4wd does NOT kick in. I know this has to do with the vacuum but I am not sure how to trace the problem. I did see one post that replaced the solenoid but I am wondering what I may can do to make sure of where my problem lies.
Any help? I appreciate it
Any help? I appreciate it
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
You can check the vacuum lines at the hubs to make sure they are still connected and not cracked/dry rotted. For that matter you can check all the lines from the hubs to the vacuum pump.
Thread Starter
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New User
Joined: Apr 2005
Posts: 3
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From: round Rock, TX
cookie88,
I did that today, hoping for an easy fix, but of course nothing ever comes easy! :^) I think what I need is a system to back track through the hoses andfind where the problemlies, then I will know what to repair.
I did that today, hoping for an easy fix, but of course nothing ever comes easy! :^) I think what I need is a system to back track through the hoses andfind where the problemlies, then I will know what to repair.
Junior User
Joined: Nov 2004
Posts: 62
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From: Back woods Mississippi.
danny c,
Also, check your vacuum pump, unplug the hose at the vacuum canister and it should kick on. Something I've also had to do on my 99 is clean the eletrical plug at the pump. On my 99 the pump sits on top of the front right fender under the hood. But you certainly have a vacuum problem.
Also, check your vacuum pump, unplug the hose at the vacuum canister and it should kick on. Something I've also had to do on my 99 is clean the eletrical plug at the pump. On my 99 the pump sits on top of the front right fender under the hood. But you certainly have a vacuum problem.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
There are also seals in the hubs. Since your HVAC controls function when in 4x2, it's logical to assume the problem is in the hub(s) and not the pump.
Oh great...now I'm sounding like a vulcan.
Live long and prosper.
Oh great...now I'm sounding like a vulcan.
Live long and prosper.
Thread Starter
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New User
Joined: Apr 2005
Posts: 3
Likes: 0
From: round Rock, TX
Than you Mr Spock. It is very possible that the hub is the problem. I replaced the seal in the L hub and possibly I put it in wrong?
I will check the plug & the pump Kilroy, thanks.
I will check the plug & the pump Kilroy, thanks.
