You can always just pull the wires on the gas valve. If valve can't turn on gas flow...furnace can't run. Your situation sounds like the thermostat not being solely in cool mode, but when you said that the furnace will run even with thermostat off...well...more like wiring issues. Good luck. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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