Don't waste anymore time, or money, until you have a block test done for the presence of hydrocarbons in the cooling system. Aside from the occasional thermostat stuck closed, failed W/P belt tensioner/belt, and low coolant level, internal combustion leaks are the major cause for overheat on these engines. The head bolt threads in the block were a poor design from 93 up until about 2004 when the thread pitch was increased.
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Wednesday, July 6th, 2011 AT 3:15 PM