Ok I have read everywhere I'm supposed to before posting. My problem is this I just purchased a 2000 jimmy with the four button 4wd when I try yo engage it the switch just kreps lighting up for 4 lo and hi it will go straight to auto 4wheel. But it doesn't really engage I have checked vac lines nd actuator under battery u can see it move when the buttons are pressed. I really need four wherl drive for the winter for the safety of my familly. I would really like to get this fixed asap. Can some one please point me in the right direction I am not mechanically inclined but I have never had a vehicle with the push buttd so I'm at a loss at this point. Thanks for reading hopefully soneone out there with knowledge of this set up can help me.