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Won't go into 4WD; no noise

(1999 Chevrolet Tahoe)
in Greenacres, WA on February 18, 2011
No clanking or clunking, but won't switch into 4WD. This model has the "push-button" on the dash.

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on February 19, 2011
i have a similar system in my 1996 GMC Jimmy and i found one of the Vacuum hoses melted in half, so i replaced all the hoses and now it works everytime. (push button systems are mostly vacuum system controlled)
check all you hoses and see if there is even a crack in them something as small as a needle prick in one of your hoses could cause the Vacuum system to loose pressure causing it to not work properly in turn "wont even seem like its turning on"
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on February 19, 2011
Hey thanks! I'll do that. It "tries" to engage -- click, click. But doesnt grind or anything. Thanks again!
on February 21, 2011
Anytime and if you find what you think is the problem when you get it fixed put it in N and hold the 4Lo button down, just after you hear the click put in D and if you feel it jurk forward like it really wants to move then you have fixed the problem
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