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Could be the fan switch but also could be the blower resistor located behind the glove box in the heater case The heater speeds are normally achieved by placing resisters in line with the 12V power supplied to the blower. When some speeds work and others don't it is often because the resister for that speed has failed. The switch is probably OK. The resisters are normally mounted on the blower motor. I don't know the details of the Saturn but the resistor bank is normally serviced without the need to replace the whole blower motor assembly. If you have a meter and can measure resistance, you will probably find the largest resistor has failed. You may be able to replace it with one from Radio Shack. Good Luck

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Q: Is a heater fan switch that works on four positions but not on low on a 2003 Saturn Ion bad?
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