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Lynn this sounds like an issue with the relay built into the furnace control board.I am a long ways away from you in South Alabama. but suggest we try to locate a Nordyne dealer close by to check this out.Can you give me the postal code where you live?
Lynn,I actually found tat Hillltop Plumbing and Heating is a Nordyne Dealer and should be familiar with the furnace.Below is a link to their website.
As mentioned the fan is controlled through the little black relays on the board.These relays will stick either open or closed and cause fan to run non stop or not come on when it should.