coolant tank, sparkplugs, we also brought this seal that said it would garruntee to seal any cracks or holes it is still over heating but it just takes longer to do it.
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2001 Cadillac DeVille DTS Question: my car is over heating after 5 miles of driving. changed the thermastat
Answer #1patrick mannion from Greg Solow's Engine Room, October 02, 2011, 12:48Master
It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. Is the electric fan working/coming in at the right temperature? It could be a restricted radiator, or a mildly blown head gasket. 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 http://www.etoolcart.com/combustion-leak-detector-lis75500.aspx. Carbon Monoxide is only present if there is a blown head gasket or cracked cylinder head. http://www.arrowheadradiator.com/head_gasket_or_combustion_leak_test.htm I think the Napa part number 700-1006. http://www.blockchek.com/instructions.htm . 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.