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Defective blower motor, blower motor resistor pack, or blower motor speed control switch.
Check the following................
1. Power and ground to the blower motor.
2. Blower resister.
3. Blower switch.
Bad resistor at the blower motor?
Bad blower motor switch?
Blown fuse, bad blower motor switch, blower motor itself, or a defective blower motor resistor pack.
The following can cause this problem..................
1. Bad blower motor.
2. Bad blower motor wheel.
3. Trash in the blower housing...