2001 Blazer 4WD not switching
My Blazer will not shift out of 4L.
Press the button & 4H blinks.
Won't switch back to 2W.
Usually that i a sign that the transfer case shift motor is stuck, sometimes lightly tapping on it with a small hammer or rock while someone pushes the 4HI button will make it run just long enough to get it into 4HI so you can drive it until you can get another shift motor.
Thanks for the points, hope it worked.