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What is some brown sluge in the water?

(1990 Honda Accord)
in Mayodan, NC on January 08, 2010
ive changed the water in my car and it keeps coming back???
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Brown sludge may be a sign that the cooling system needs to thoroughly flushed out with a flushing agent and refilled with fresh antifreeze. Brown/orange color sludge may indicate your engines cylinder head gasket is mildly leaking and allowing acid combustion gasses into the cooling system. The most accurate way to test for a blown head gasket on a gasoline engine is to test for the presence of carbon monoxide in the cooling system. Snap-On, Matco (part # CO 2000), and Napa sell a tool to check to carry out this test. Another link to a supplier of this tool is Carbon Monoxide is only present if there is a blown head gasket or cracked cylinder head. I think the napa part number 700-1006. . Signs of a blown head gasket are coolant loss (frequently have to top up the coolant level of the engine without seeing an obvious leak), experiencing over heating or rough engine running or the presence of white sweet smelling steam from the exhaust. A badly blown head gasket may allow engine coolant and oil to mix.
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