Question about 1995 GMC Jimmy
Blew water out of vacuum lines to transfer case ( thanks for the tip ) and indicator light is now working. However, even though light indicates 4wd,and it sounds like it is engaging, it does not actually go into 4wd. Is there possibly a vacuum line on front axle with water in it that won't let it engage?
I had that problem on my 1996 not sure the proper term but there is a pin that was seized on mine and the pin is what locks the 4x4 in hope this helps
Posted on Feb 12, 2013
My 1996 GMC Jimmy had the input shaft seal in the transfer case go bad which then let the transfer case pull fluid in from the transmission allowing it to overfill. This has led to transmission fluid clear up in the HVAC vaccuum hoses and actuators as well as the front axle servo.
Posted on Dec 21, 2008
Just like previous poster. I had the same deal. I took out the battery and its tray. Underneath is
the servo which in my case had the vacuum line off. I put the vacuum line back on and put it
all together and my 4 wheel is working great.
Posted on Dec 20, 2008
I have the same problem as well, but this is the solution i have found, which i have yet to try.
"look under the battery for th4 4x4 servo. it looks like a cruise control servo.
or could be the vac switch in the t-case. thses trucks were know for the vac switch to go bad. whick would cause it to **** tranny fluid into the vac lines to the servo. whick cause's the rubber to get soft and weak. which would cause it to not hold vac or tear the rubber."
from S-10 forums.
Please leave a reply to clarify if this fixes your problem as well.
Posted on Dec 17, 2008
Tips for a great answer:
Transfer Case Description and Operation for the Transfer Case - NVG 246-NP8
Transfer Case Description and Operation for the Transfer Case - NVG 261-NP2
Transfer Case Description and Operation for the Transfer Case - NVG 263-NP1
The SERVICE 4WD indicator is located in the instrument panel cluster (IPC), and shares the common power and ground of the IPC. The transfer case shift control module controls the service indicator by sending the IPC a Class 2 message. This indicator may be controlled with the scan tool using the IPC device controls.
You should take it to the dealer an have it checked for DTC'S -diagnostic trouble codes
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