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Q: Problem with cooling system on 1997 Chevrolet Astro

I have a brown residue in my over flow tank and also in the top of my radiator,is possibly a blown headgasket?
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GM was putting something called Stop Leak Tablets in their cooling systems from the factory. This residue may be due to the tablets. Check the oil and see if it is a milky white color. This will let you know if the oil and coolant are mixing. IE: head gasket, intake gasket, etc.. If you are still worried you can rent a compression tester from an auto store and check compression on each cylinder. If you had a blown head gasket this would affect the drivability of the vehicle.
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