The Cooling Fan Assembly is used in Toyota Sienna car models where functions to control the engine temperature through circulation of air over the radiator. This assembly is usually a fan blade, a blade shroud and a motor placed close to the radiator to cool the hot liquid before it gets into the engine. In Toyota Sienna models, both cooling fan assembly mechanical as well as electric have been implemented. The mechanical fans are mounted on the water pump shaft; they have a thermal clutch, in this way, at high speeds, they work effectively but consume less fuel and produce less noise. While the mechanical cooling with the help of the viscous pickup is constant, electric cooling fans installed in the car come with a 12V motor and power up when the coolant temperature or the air conditioning call increases the need for proper airflow through the radiator or a condenser. It is important to note that the construction and working of these cooling fan assembly could differ between generations of Sienna due to improved technology, and performance.
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