Hello, I have a 99 chevy blazer LS. My 4wd just started not working, I push the button and you can hear it engaging, and it feels like its in 4wd, but its not. What might be the problem, or where should I look first. Thanks!!

Does the shift buttons work right?
233 or 236 transfer case?
Auto matic push button on dash?
On a 233 no auto matic push button
Check front drive shaft and axel for locking in.
Can you get a crow hop on a tight turn in 4 wheel?