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Olds 99 silhouette overheats when driving

(1999 Oldsmobile Silhouette)
in Chicago, IL on September 12, 2010
Car overheatings: have replaced thermostat, water pump, radiator and cap flush system had used magic sealant for intake manifold problem repair manifold gasket problem
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Popular Answer
on September 13, 2010
have tested for leaking combustion gases into cooling system, head gaskets tend to fail on #1 cylinder.
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of Greg Solow's Engine Room on September 13, 2010
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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