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A thermostatic clutch is usually used on a car's engine cooling fan. It uses a bi-metallic spring, which tightens and forces the fan to turn when the air temperature inside the engine compartment reaches a certain level.

Basically is used to prevent the fan from wasting your engine's power when there is no need for cooling, by allowing the fan to freewheel when the engine is cold. It then serves as a device to automatically engage the fan and keep the engine cool when necessary.

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