If your transmission fluid and coolant look normal in color and the transmission still works correctly, I don't think you have to worry about the above. If it is just coolant, you just have to find the leak and fix it. You can buy an aftermarket fluid cooler and bypass the factory unit completely if you are worried about the fluids mixing. They are right around $30-$40 for the size the Neon needs, and should cool better than the factory unit as well.
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