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2003 Ford Explorer Question: OVERHEATING

 

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FRUSTRATED10, 4.0L V6 SOHC, Valrico, FL, January 23, 2010, 13:09
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TRUCK OVERHEATING HAD A CRACKED THERMOSTAT HOUSING REPLACED IT THE THERMOSTAT AND O RING. REPLACED WITH OFFICIAL FORD PARTS WHAT CAN MY PROBLEM BE???

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    patrick mannion from Greg Solow's Engine Room, January 24, 2010, 12:09
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    Many things can cause engine over heating, check the fan operation, check for a restricted radiator, and worst case check for a blown head gasket. Pressurizing the cooling system to inspect for other leaks could also indicate other problems.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-lis7550.... Carbon Monoxide is only present if there is a blown head gasket or cracked cylinder head. http://www.arrowheadradiator.com/head_gasket_or_combustio... 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.

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