Wont go into 4 wheel drive

Your linkage may be broke

have you tried some of the chevy 4x4 forums. they have diagrams and many work on these vechiles. i have received good info from them before

Put it neutral and then hit the button for 4 Wheel drive. It should work then and do the same to take it off 4 wheel drive.

you will know if you are in 4wd if you take it on a dry road. you will feel it fighting you when you turn sharp.. as for the blinking lights . that's your truck saying..........please take me in for some servise

put it in neautral and hold the brakes then try it

2002 chevy s10 4 door 4x4 4 wheel drive wont engage

Try to wiggle the wheel right to left, back and forth, while trying to turn the key. It might come unlocked soing so. If not, the ignition switch may be messed up.

sounds like the 4 wheel drive
switch in the transfer case is bad.

truck needs to be in neutral before it can shift back to 4 hi and then shift to 2 hi

Pull the kick panel on the passenger side. there is a small box mounted there that is the computer that controls the actuator for the 4wd system. this is notorious for problems due in fact that the connector likes to pull out and away from the module. I had the same problem and the solution is simple.. take a long zip tie and get it between a few of the wires and around the module. tie it in and have a nice day.. it wont come off or try to pop out anymore and you should have no issues getting into 2wd, 4wd h, 4wd L.