94 4x4 won't go 4 wd no light

shift lever into 4wd but no light comes on and it has no 4wd no noises heard just happened with no indications of any possible problems. I checked the fuses all ok bulb is ok but has no power to it is there any sensor on
the transfer case .I checked connections on tranny and trans case look ok where do i start?
Any help would be nice thanks soken wet snow storm
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
More than likely the actuator that shifts the front end into FWD has gone out. These work by a heating element that heats oil, pressures the oil and then locks the front axle. Piss poor GM design, in cold weather or crossing a steam etc it can actualy shift out once its been shifted. You can replace it or go with an aftermarket design like this one http://www.drivetrain.com/4x4PosiLock.html
Russ
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Since you have a manual shifted unit. Take a look under the battery and see if the front axle actuator moves when you shift the lever. If not then it is probably the vacuum controller valve on the transfer case. The valve has three lines on it and you can replace it without much effort.
--
Steve Williams


"Larry Starr" < snipped-for-privacy@verizon.net> wrote in message
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
i had the same problem with my 86 blazer at first but sometimes its not the actuater sometimes its the hoses that run down the back end of your transmission and engin sometimes they melt or during winter they dry rote and break due to salt from snowy roads so locate your hose and trace it to make sure its not melted or busted....
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
i had the same problem with mine its simple its the hoses that run from your transfer case to your acuator "vaccume hoses" sometimes due to salt from the roads during snow season the mildue or rot in this case they bust open letting no suction to occure or could also be that considering they run down the side of your engine and tranny it causes it to get hot and melt so either way no suction is occuring.....
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
. . (concerning no 4wd) . . 86chevyblazer wrote:

====================
I agree......
sorta..kinda....
The OP needs to check for vacume at the front diff. actuator...... and if good vacume isn't found, then check vac at the switch on the t-case....going in and out of the switch. . (you'll have to cut the hoses and resplice after checking for vac at the t-case switch....unless you get a good vac reading on the first step at the front diff) .
~:~ MarshMonster ~basic i/o diagnostics~
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.