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This happened to me because the electronic temperature sensor on the radiator that told the fan when to be on was faulty, so the fan was on all the time. Even at -20C.
reply to post by TinkerHaus
Sounds like the thermostat is stuck open or was taken out. If the heater wasn't working but the gauge was the right temp, I would say it was low on water. It would pay to check the water anyway, maybe the gauge isn't working right and the water is low causing the heater not to throw out heat. Use 50 50 antifreeze if adding water to the radiator or the jug.