If the only speed that works is HIGH, then you need to replace the blower fan resistor block, as mentioned by the first two respondents. If it runs on HIGH, regardless of speed setting, then either the HIGH fan relay is stuck closed [replace it] or the fan switch on the dash has shorted out and needs replacement.
Sorry Steve it is the resistor but it's located behind the glove box in the heater housing.
If it only goes on high, the resistor needs to be changed . It is on firewall ,passenger side of car under wiper assembly behind alternator. not a hard job to do, part is not expensive. you will get low,med , and high back. if not switch on dash panel, or change blower motor, last ,since it is going on- working. good luck
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