It's located underneath the glove box on the passenger side. There's a trim panel that you need to remove to access it. I have included a link to a video that will walk you through the process of removing the panel and also how to replace the old blower motor with a new one.
Loose connection or blower motor is bad
down uner the glove box
There is a removeable panel below the glovebox. It is in front of the blower motor against the firewall. It has a wire connector from the loom and then it plugs into the blower motor
If you are referring to the blower motor speed, and only the highest setting works, then the problem is a bad Blower Motor Resistor Pack.
Your blower motor working even after the car is off is a good sign. This means that the car's system is preventing your car from overheating.
Recommend you check the blower motor resistor.
Engineering
On the Passenger Side, behind the Firewall, in front of the Glove Box. Remove the Kick Panel for access.....
check the fueses check fueses
There is only one blower motor resistor and it is located in the evaporator housing.
Replace the blower motor resistor.
How to change blower motor on 2000 grand am gt