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Old 10-20-2005, 12:48 PM
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the thermostats purpose is to hold back water long enough for the radiator to radiate the heat off the coolant just cycled from the block, once the temp of the coolant in the engine gets to the thermostats opening temp it opens and the cycle starts over. If there`s no thermostat the coolant can flow too quickly causing the engine to overheat since the radiator won`t have time to radiate enough heat to properly cool it.
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