ACDelco 38489 Gold Drive Belt Tensioner Assembly with Pulley

The ACDelco 38489 is an ACDelco Gold 90-degree molded accessory drive belt tensioner assembly designed as a high-quality alternative to Original Equipment (OE) parts. Manufactured to meet specifications for fit, form, and function, this serpentine belt tensioner maintains the correct amount of tension on the drive belt throughout operation, ensuring reliable performance of all belt-driven accessories.

The tensioner features a patented vibration damping system that absorbs extreme vibration to help extend the service life of the tensioner, the drive belt, and connected accessory components. The torsional round spring design delivers consistent tension while resisting contamination for enhanced long-term durability. The steel construction provides a natural finish and lasting strength in demanding engine bay conditions.

Key Features:

• Patented vibration damping system extends tensioner, belt, and accessory component life
• Torsional round spring design provides consistent, reliable belt tension
• 90-degree molded design for precise OE-style fitment
• Steel construction for durability in high-heat environments
• Serpentine belt type; pulley outside diameter: 3.1 in.
• Pulley center bore diameter: 0.394 in. (10.00 mm); pulley width: 1.260 in. (32 mm)
• Two mounting holes for secure installation
• OEM part number cross-reference: 19188103
• Covered by a limited lifetime warranty for the original purchaser

ACDelco Gold parts (formerly labeled ACDelco Professional) are backed by General Motors and represent a premium aftermarket solution engineered for a wide range of applications. For best results, always replace the drive belt and tensioner together — a worn tensioner can reduce belt lifespan and lead to issues such as overheating, battery drain, reduced power steering, or diminished air conditioning performance.