Have a central forced air furnace and central air system. Thermostat set to fan only works right, Set to furnace and everything works right. Set to Air cond. and compressor kicks on but fan will not work. Pressure line is cold and return line is hot as normal. had an old programable thermostat with out any papers on operation or hookup. Replaced and problem stayed the same. Ideas please?
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Need HELP in a hurry!!!!!!