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2004 Chevrolet Chevy Suburban Information on Gradual Coolant Loss Over Time with No Evidence of Leak Found

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Filed Under (Chevrolet Manuals) by admin on 23-01-2012

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Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area. Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head. Important: If the cylinder head(s) are Not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss. Refer to the following illustrations on how to identify Castech casting and/or the very specific areas of the cylinder head(s) for a coolant leak from porosity. If the cylinder head(s) is a Castech casting (1), inspect the area around the five oil drain holes for witness marks indicating coolant seepage over time (2). Important: If No evidence of coolant loss is found on inspection of Castech casting cylinder head (s), follow normal diagnostic procedures in SI to determine the cause of the coolant loss

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