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Old 07-09-2012, 01:52 PM
Dirty Harry Dirty Harry is offline
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Join Date: Sep 2002
Location: Rushville, IN
Cobra Make, Engine: red Shell Valley, white stripes
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Make sure that the radiator hose is not collapsing with increased water pump speed and shutting down the normal flow. Some hoses have a coiled spring inside them to prevent this from happening. See if it is easy to squeeze either of the hoses, particularly the bottom one, to the point where flow would be seriously affected. Obviously, don't do this when the engine is quite hot.
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