the fans only cool what is in the radiator and the thermostat opens at a set temperature and sends the water to the radiator to be cooled. if the water in the radiator is cool already it wastes energy keeping the fans on. If the thermostat is opening too soon the engine will not be running at the required temperature and the oil may sludge up and foul up the inside of the oil galleries over a period of time. Also the engine may use more fuel than it should if the ECU temperature sensor doesn't get to the designed temperature and provide the correct resistance.
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05-11-2006, 18:11
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