If no air [hot or cold] is blowing when you turn on your fan, then it sounds like the blower motor in your Buick is not working.
I recommend you bring it in to your repair shop for verification and repair or replacement of the broken part.
〉 Answered on Oct 26th, 2014 by Amy Mattinat, Owner and Author at Auto Craftsmen Ltd
Could be blower motor and/or resistor...
〉 Answered on Oct 26th, 2014 by Gelina Aquilina, Service Advisor / Mechanic at