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If it isn't now seeping your BLUE brand of anti-freeze, I think we can now ascertain that you don't have a coolant leak, and therefore, tightening coolant system hoses isn't going to be of any help.What I see seeping looks more brownish.
Have you taste-tested the brownish seep stuff to see if you can tell exactly what it is? Brownish stuff would seem to me to be more along the lines of an oil seep. I guess that perhaps fried green anti-freeze might turn brownish, but a quick taste-test should be able to pinpoint that, as any anti-freeze I ever put to my tongue had an unmistakable sweetness to it, whereas any oils were just plain nasty and/or bitter.