I have a 1995 blazer and I was in snow, put it in 4high and hit the gas and only the rear wheels spun. the lights on the push button 4x4 work as they should. I've checked the 4x4 actuator and it works good. anyone know what could be wrong?

 

You say you checked the actuator. Did you check it by hand or did you watch it engage while someone pressed the button? If it works by hand, that doesn't mean it's gonna work by button. You could have a slight vacuum leak. I'm having 4x4 issues right now myself....

 

I had someone push the button and I watched it engage