Replace fan switch in dash.Or may even just need connections cleaned with some wd/40. To replace switch you need to remove dash and knob's, Then you have a switch that has the wires from fan to connector. . If these are ok and clean you need to replace your blower motor, Best of luck to you.
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If your friends blower only works on 2 positions then you need to replace the blower motor resistor. Its right behind the glove compartment which is very easy to remove. As for the A/C not working, that could be the fan switch being bad but most likely an issue with the A/C copmressor motor or the fuse for the ac compressor motor.
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