Can i use a used blower moter from the junkyard , my blower moter went out.

You'll have to try local salvage yards near you; it's possible you'll find one. But are you even certain the blower motor is the root cause of failure? What testing has been performed? Several other things can cause no fan operation. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops