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.
The blower may simply have burned out. If the blower is out then the heater probably still works.
Pull blower its up inside hole
The heater blower motor itself is located under the hood on the passenger side of the car.
Have you checked your coolant? Kind of obvious but sometimes overlooked.
sometimes this is caused by the blower resistor heating up and shutting the circuit down, or it could be in the blower itself heating up and shutting down.
blower motor bad or no power to it chech fuses blower switch blower motor
My blower doesn't go on when i turn it on can you tell me what is my next move to fix
It should be in the heater blower motor case which is located under the glovebox.
You can test your heater blower motor by connecting a ground wire to the ground. Connect a power wire, from the battery to the positive post. If the blower motor turns it is working, and if it does not it is bad.
the resistor is gonna be right off the blower motor attached to the blower motor by a wire harness should be by the heater core
Your blower motor is going out. Be prepared to replace it soon or it will just quit working all together.
Test the resistor bank before getting into anything else. These are the speeed controls for the blower motor.