Dorman 419-102 Accessory Drive Belt Tensioner Assembly - Air Conditioning

Dorman 419-102 Belt Tensioner Assembly

Dorman 419-102 is an accessory drive belt tensioner assembly built to match the fit and function of the original equipment unit on specified vehicles. It is engineered with quality components for durability and extensively tested for reliable operation in serpentine belt systems.

Key Features

• Accessory drive belt tensioner assembly for serpentine belt applications
• OE-style fit and function for specified Chevrolet, GMC, and Oldsmobile vehicles
• Counter-clockwise tensioner rotation
• Single pulley design with one pulley bearing
• Pulley material: polyamide 6.6 with 30% glass fiber fill
• Package contents: belt tensioner and bushing
• Cross-reference: Continental 49208 and Gates 38108

Detailed Description

This Dorman belt tensioner assembly is a direct replacement for the factory accessory drive belt tensioner used on a wide range of GM trucks, vans, and SUVs. It is built for serpentine belt routing and is listed for applications such as 1987-1995 Chevrolet Blazer, 1988-1995 Chevrolet S10, 1987-1995 GMC Jimmy, and 1991-1995 GMC Sonoma, along with many C/K-series and G-series models. The part number 419-102 is also referenced by other aftermarket catalogs for the same application, including Continental 49208 and Gates 38108.

With a 40 mm pulley bearing diameter, 90.3 mm outside diameter, and counter-clockwise rotation, this tensioner assembly is specified to match the original setup on vehicles that use a manual-control air conditioning configuration or non-off-road-air-cleaner applications where noted. It is a practical replacement when the original tensioner no longer maintains proper belt tension or the pulley assembly shows wear.

What It Helps Address

• Serpentine belt slack or inconsistent belt tension
• Squealing or chirping noises from the accessory drive belt system
• Worn or noisy tensioner pulley bearings
• Belt tracking issues caused by a failing tensioner assembly
• Accessory drive performance problems related to belt control

Installation Notes and Fitment

Verify engine configuration, air conditioning setup, and RPO code notes before ordering. Fits 1987-1991 Chevrolet Blazer, N/A; Fits 1992-1994 Chevrolet Blazer, N/A, wo/RPO Code 9K3 (Off Road Air Cleaner); Fits 1995 Chevrolet Blazer, N/A; Fits 1988-1995 Chevrolet S10, N/A; Fits 1988-1994 Chevrolet S10 Blazer, N/A; Fits 1987-1991 GMC Jimmy, N/A; Fits 1991-1995 GMC Sonoma, N/A; Fits 1991-1994 Oldsmobile Bravada, N/A. Additional coverage includes many Chevrolet and GMC C/K, G, R, and V series applications with the notes shown in the fitment data.

Before installation, confirm pulley alignment, belt routing, and tensioner rotation match the original unit. Use the vehicle notes to confirm whether the application is for Air Conditioning, Manual Control, or a specific off-road air cleaner exclusion.

Quality Assurance

This replacement tensioner assembly is engineered with durable components and tested for reliable performance to meet the demands of daily accessory drive operation. Dorman designs this part to replicate the original equipment fit and function for the listed applications.