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 I would say check you hose connections at radiator. Alot of those rust out right there and is hard to notice. So I agree with the "Time to replace radiator" due to location your describing. But b4 you spend the time and money, your sure it's radiator fluid?

  I only ask because you stated only after an hour n half. The natural evaporation from condenser happens then. And it flows on passenger side rail, that can flow to bumper. This happens after shut down of engine, and at idle. 

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