Chevrolet Silverado serpentine belt routing
Start with the exact year, engine and equipment. For the checked 2012 Silverado 1500, Chevrolet shows different V6 and V8 routing drawings. The checked 2WD 5.3L V8 service manual also separates the main accessory belt from an A/C compressor stretch belt. A single belt diagram or replacement method does not cover both.
Checked 2012 Silverado 1500 routing and procedures
Chevrolet's 2012 Silverado owner guide has separate V6 and V8 drive-belt drawings on printed page 12-6. Its diesel and hybrid models use separate supplements. The service-manual examples below are specifically 2012 Silverado 1500 2WD; confirm your engine, drivetrain and A/C equipment before following one.
Open Chevrolet's V6 and V8 routing drawings4.3L V6, 2WD
The checked replacement procedure uses a 3/8-inch drive breaker bar on the tensioner arm and rotates it counterclockwise. Its illustrations distinguish trucks with and without A/C. Follow the matching routing drawing and check belt alignment after installation.
5.3L V8, 2WD
The checked accessory-belt procedure uses a breaker bar and hex socket at the tensioner bolt, rotated clockwise. The separate A/C compressor belt is a stretch belt: its procedure calls for cutting off the old belt and using the disposable installation tool packaged with the OEM replacement belt. Do not apply the accessory-belt tensioner method to that A/C belt.
When to inspect the drive belt
The checked 2012 Chevrolet maintenance schedule calls for a visual inspection of accessory drive belts at 150,000 miles (240,000 km) or 10 years, whichever comes first. Look for fraying, excessive cracking or damage and replace a belt if needed. This is an inspection schedule, not a rule to replace every Silverado belt at that mileage. Use the schedule and condition of your own vehicle.
Tool for the checked 4.3L procedure
The 2012 2WD 4.3L service procedure calls for a 3/8-inch drive breaker bar at the tensioner arm. This is a general tool search, not a verified product listing or a belt-fit recommendation. Check your truck's exact procedure before buying or using a tool.
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This vehicle's factory manual
Chevrolet Silverado: choose your year, then confirm the engine, trim, or drivetrain to open the available repair and diagnosis sections.