The main reason is a defective blower resistor. Normally the lower speeds on the fan switch go out first and leaves just the high speed working. Either your resistor is bad, the blower motor itself is dead, or you have a blown fuse - check the fuse box.
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The main reason is a defective blower resistor. Normally the lower speeds on the fan switch go out first and leaves just the high speed working. Either your resistor is bad, the blower motor itself is dead, or you have a blown fuse - check the fuse box.