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Could be one of two things. It could be the head/control unit. Or, more probably, the fan resistor has gone bad. Look under the dash on the passenger side. Remove the sound insulator if it is there. Look at the heater box. You should see a rectangular flat flange with either a connector (4 pin, I think) or 4 heavty guage wires coming out of it. It is held in place by 2 screws. Remove and replace.
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