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Yes, the thermostat is what cycles the water through the coolant system. When u first start your car cold, the thermostat stays closed, this allows the heat from the engine to raise the themperature of the engine to operating temperature. When the system reaches optimum operating temperature, the thermostat opens and allows the hot water from around the engine to move to the radiator and the water that was in the radiator to move to the engine. The water in the radiator is signigicantly cooler because the air from the fan(s) and from the forward motion of the vehicle moves the heat away from the radiator. When the cooler water from the radiator reaches the thermostat it closes to allow the engine to warm up to temperature again. This cycle continues the entire time your vehicle is running. Engines are more efficient when they operate within a certain temperature range. If the engine is too cold, the oil is less viscous and the ionization of the fuel through the fuel injectors is less consistant which in turn provides poor ignition within the cylinder exhausting unburned fuel. If the engine it too hot, the oil breaks down and the fuel prematurly ignites causing knock. Not to mention the fact that your engine will eventually melt.

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Q: Your car takes 30 minutes to blow warm air and the temperature gauge doesn't move. Do you think It needs a new thermostat?
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