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If it is a push button four wheel drive system there should be a soft vaccum line the runs to your front end where your axle shafts are connected. There is a little box there which is what controlls your two wheel and four wheel. It's possible that the line is dry rotted and won't hold enough pressure to switch out of four wheel or also possible that the sensor there has gone bad as well.
Start out with buying yourself a $25 book from the Parts House. The I would go to the front HUBS, secure & safety vehicle before you do anything, Clean, Inspect, Lune & Repair front Hubs as required, get the brakes while you're there. Check your drive line, axles, u-joints etc. Clean , repair , replace as needed. Check for Tranfer case Operation. Is there power going to the front Axle when 4WD is engaged? do you feel a change when you engage the Transfer Case? Have you checked the Power on the circuits? Have you Manual or Auto-locking Front Hubs? Answer all those Questions & read before you do anything.
Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!