I have a 2000 Chevy Blazer LT 4.3L. Push button 4 wheel drive with the automatic 4 wheel button. The problem that I have is that when I push in 4HI the light blinks and goes away. When I push 4LO the light just keeps blinking. I can hear the transfer case engage and the actuator in the cab clicking. The front wheels are locked in cause I can feel the power. So my question is why is the light blinking in 4LO and disappearing in 4HI?