Engaging efficiency-viscous fan couplings

Despite being part of more than 960,000 vehicles in the UK, viscous fan couplings (also known as viscous or viscous fan clutches in the aftermarket) are one of the lesser known products in the engine cooling system.

Viscous fan couplings essentially control fan speed to aid engine cooling and are used on cars with inline engine positions, mainly rear wheel drive.

BGA delves into the mechanism of the part, common causes of failure and the best practice to check that your viscous fan coupling is operating correctly.

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