Basically, it connects the engine’s fan to the water pump pulley, but it doesn’t connect them rigidly. It’s filled with a special silicone fluid, and that fluid’s how it works. As the engine heats up, the fluid thickens. That thickening is what actually drives the fan, and the hotter it gets, the more the fan spins. When the engine is cold, it allows the fan to spin freely, so you don't have a lot of engine drag. It smoothly controls how much air the fan pulls through the radiator. Think of it as the smarts behind your cooling fan. Older cars used a fan that just spun at the same speed as the engine, all the time. This coupling lets the fan speed adjust automatically to what the engine needs. It's part of the cooling system, helping to prevent overheating. It sits right between the fan and the pulley. You’ll notice if it’s failing, because the fan might be noisy, or it might not be pulling enough air when the engine gets warm. It’s really important for keeping your engine at the right temperature. If it goes bad, you can overheat, which can cause some serious damage, like a blown head gasket or even a warped engine. A failing one also puts extra strain on the water pump. It acts like a shield, protecting your engine from damage caused by excessive heat. It’s not something you want to put off fixing. You can usually find a good replacement at places like Fixparts Online, and they’re generally not too difficult to replace if you're comfortable doing a little work yourself. Shop with confidence: Viscous Fan Coupling (MPN 17855) comes with a 3 year manufacturer guarantee!

About Febi

Ferdinand Bilstein is a leading global supplier of aftermarket spare parts, offering an extensive range of high-quality components for passenger and commercial vehicles.

Why Choose Febi?

• Febi parts are made to the same standards as original equipment, so you know they'll fit and work well. • We offer a really wide range of parts – everything from engine components to wear and tear items – so you can find almost anything you need in one place. • Febi has been around for over 75 years, so we have a lot of experience and a reputation for quality. • Our prices are competitive, giving you great value for reliable parts. Performance you can rely on – Febi parts from FixParts Online.