95 tahoe 4 wheel drive not working

Discussion in 'GM Powertrain' started by shadetreedad, Feb 20, 2010.

  1. shadetreedad

    shadetreedad New Member

    here's the deal. I just bought this truck and the 4 wheel drive doesn't work. I'm pretty sure I have narrowed it down to the shift actuator. here is whats going on. the drive shaft turns when the truck is shifted into 4 wheel drive. I have 12 volts at my shift actuator and my grounds are good. I took the actuator out and installed a used junk yard actuator and it still doesn't work. I can put the truck in 4 wheel drive and watch the actuator and it does not move. how ever if I apply 12 volts and a ground manually from the battery it does come out slowly. Does anyone know any for sure way to test these actuators? Any ideas? Thanks.........more info... today I bought a new actuator and the 4 wheel drive is still not working. Does anyone know where I can get the 4 wheel drive schematics for this truck?
     
    Last edited: Feb 21, 2010
  2. Mumbles

    Mumbles Member

    I see this thread is a couple months old, but if you haven't been able to fix the problem you may want to check the vacuum switch on top of the tranfer case.

    I know on my S10's its located on the driverside and has three vacuum lines running into the top of it. Once you remove it, you can see it has a ball valve located on the bottom. Sometimes this valve gets rusted and will stick and nolonger perform properly.

    I hope this helps. Good luck.
     

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