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@Alexnharvey
I suggest you apply the most heat you can as directly as possible to the nut. Blowtorch, soldering iron, even a cigarette lighter are going to do a lot more than the the radiator or hairdryer.
Keep going with the wd40 if ti's the best you've got. A drop of diesel or acetone (nail polish remover) will help any oil to penetrate into the threads. A little motor oil/3in1 oil and a drop of acetone make a good quick penetrating oil mix.
Edit obviously you need to take care if you are using direct flame around the flammable liquids like acetone or diesel and oil.