Browse Chrysler 300 Series Idler pulley replacement & Chrysler 300 Series Guide pulley. Shop Chrysler 300 Series Belt idler pulley. Maintaining the idler pulleys of your Chrysler 300 Series ensures smooth operation and longevity of your engine's serpentine belt system. Regular inspection for signs of wear, such as squealing noises or visible damage, is crucial, as these are indicators that a replacement may be necessary. Extend the lifespan by choosing pulleys made from durable materials and by keeping them clean from debris. When selecting a new idler pulley, consider the model-specific design and the pulley's bearing type, whether it's a flat or grooved pulley, to match your 300 Series' requirements. Proper installation is key, so follow the manufacturer's guidelines closely or opt for professional fitting to guarantee optimal performance and safety.