heater fan control only works on high on 2000 Ford Focus

heater fan control only works on high

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2 answers
what is the answer
Usually a sign the heater blower resistor pack has failed. Right next to the heater blower motor under side passenger side of dash. four wires all have a black trace on them with the following colors, blue, yellow, white and orange. Part is about $20 about .5 hour to replace.