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
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
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
"Larry Starr" < firstname.lastname@example.org> wrote in message
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....
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.....
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)
~basic i/o diagnostics~
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