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If no air is moving, it could be the blower motor. I've owned several Pontiac models, and have noticed heater blower motor problems.
My son own a 2003 Pontiac Bonneville. One day he said when he turned on the heat that no air was moving, I removed the heater blower motor and throughly cleaned it. I hooked up back up and it worked fine. The motor can get dirty form accumlated dust and grim. Do a search online for its location.
The blower motor works on high setting ONLY when the blower resistor is
bad. The blower motor resistor is held in place with 2 screws and
attached into the heater housing under the right side of the dashboard.
You can identify the resistor by the big wires that are connected to
the connector. If this heating/cooling system is the auto temp type,
the part is a bit high on the price.