either the switch or the fan motor
Blower resistor switch
you have a bare wire touching on your blower motor
A 2000 Toyota Camry has an ignition switch fuse location in the main fuse panel. It helps protect the switch and the rest of the ignition system from surges.
The blower is controlled by the blower switch, blower resistor, and relevant power relay.
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.
There is none.
Well it is apparent that all is not ok. The speed of the blower motor is controlled by the blower motor speed control switch and the blower motor resistor pack. One of those two items is your problem. I would bet the blower motor resistor pack is defective. The only way to know for sure is to replace it.
The blower may simply have burned out. If the blower is out then the heater probably still works.
Inside the rear view mirror! Enjoy.
Check for a bad blower resistor at blower motor
Loose connection or blower motor is bad
bad blower,buy a good one and replace