This pulley is pretty straightforward. It's basically a wheel that the serpentine belt wraps around. Its job is to guide the belt and maintain tension as it goes around all the different components – your alternator, power steering pump, air conditioning compressor, and so on. It doesn’t drive anything itself, it just makes sure the belt stays on the right path and with the right amount of pull. It has a screw built in, so you don’t have to worry about sourcing that separately. Think of your serpentine belt as the power delivery system for a lot of important engine functions. The idler pulley is part of that system. It’s positioned strategically to help the belt route around everything smoothly. It helps prevent the belt from flapping or getting misaligned, which could lead to noise or worse. If this pulley goes bad, you’ll notice it. A failing idler pulley will often make a whining or chirping sound, especially when you first start the car or when you put a load on the engine—like turning on the AC. It can also cause the belt to wear out faster. A seized pulley can actually snap the serpentine belt completely, and that’ll leave you stranded, because your battery won’t charge, you’ll lose power steering, and your AC will stop working. It's a relatively inexpensive part, and replacing it is a good way to prevent bigger problems down the road. We carry a lot of these at Fixparts Online, and they’re generally pretty easy to swap out if you’re comfortable doing a little DIY work. Shop with confidence: Idler Pulley for Serpentine Belt with Screw (MPN 100171) 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 get reliable quality. • We offer a really wide range of parts, covering most makes and models – meaning you can likely find everything you need in one place. • Febi has been around for over 75 years, so we know a thing or two about auto parts and what mechanics need. • Our parts are priced fairly, giving you a great balance between quality and cost. FixParts Online – Your Trusted Source for Quality Febi Auto Parts.