Originally Posted by DoubleVision
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.
If the water stays in the radiator longer to get rid of more heat, isn't it also staying in the engine longer and building more heat? Flow Cooler water pumps claim a temp. reduction by circulating water faster.
A computer controlled engine will run very poorly without a thermostat.