yes, the fan bearing is worn out
The blower may simply have burned out. If the blower is out then the heater probably still works.
resistor for fan blower is in back of glove box, beside the blower itself.
the heater blower is located under the dash on the passenger side. easy to change ,4 skrews.
The blower on the back heater may need to be replaced on the 2000 Ford Winstar.
If a 2000 Grand Am sometimes has the heater blower working and sometimes it won't, the problem could be with the heater relay switch. The heater relay switch lets the heater blower know when to come on and when to go off. In most vehicles this switch is behind the glove compartment. This part sometimes gets corroded from condensation in this area.
fuse or relay most likely
To change the heater blower motor on a 2000 Chevrolet Astro Van open your hood. After you open the hood you will see the heater box on he passenger side remove the four bolts holding the motor in and pull it out.
down uner the glove box
There is a fuse under the hood for the blower motor.
Under the hood, passenger side firewall, close to the heater blower motor.
replace the blower motor resistor. it is located on the firewall near the heater hoses.