My furnace (1995 Dutchmen) was blowing cold air when the heater was set to 90. I went and unplugged two wires on the furnace and heard the igniter turn on and it started working. Think there's a short...
Chris will know more, but I think your thermostat is suspect. That is somewhat of an old mechanical style. You should be able to pick up a digital Hunter from local Walmart that should be able to handle what you have. Wait to see what Chris has to say.
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