The viscose fan is attached to the water pump and designed to cut in and out depending on the temperature of the water. The fan will last at least 5 years or 100,000Kms. After this the fan should be checked periodically every 10,000Kms for its effectiveness. The viscose fan is a fluid substance that changes its viscosity depending on the heat, allowing the fan to freely move or lock up on a one to one ratio with the pulley.
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