2015 Chevrolet Suburban Serpentine Belt Routing & Replacement Guide

The serpentine belt is a critical component of your 2015 Chevrolet Suburban's engine, powering accessories like the alternator, power steering pump, and air conditioning compressor. Regular inspection and timely replacement are essential for preventing breakdowns and ensuring optimal performance.

Quick Answer

• Belt Length: Approximately 2240mm (88 inches)
• Rib Count: 6-Rib
• OEM Belt PN: AC-Delco 6K888 or 12610740 (Always verify with your VIN)
• Aftermarket Cross-References:
  • Gates K060888
  • Dayco 5060888
  • Continental Elite 4060888
• Auto-Tensioner PN: AC-Delco 12628416 (Always verify with your VIN)
• Idler Pulley PN: AC-Delco 12595825 (Always verify with your VIN)

Belt Routing

Before you begin any work, it's highly recommended to take a photograph of the existing belt routing. This will serve as a crucial reference during installation.

The serpentine belt on your 2015 Chevrolet Suburban, regardless of engine option (5.3L V8 or 6.2L V8), typically follows this path:

1. Starting from the crankshaft pulley (the largest pulley at the bottom, directly driven by the engine).
2. The belt then goes up to the A/C compressor pulley.
3. From the A/C compressor, it routes under the idler pulley.
4. The belt then travels upwards to the alternator pulley.
5. From the alternator, it moves to the power steering pump pulley.
6. Next, it wraps around the water pump pulley.
7. Finally, it passes around the automatic tensioner pulley, which maintains proper belt tension throughout.

Note: Some engine configurations or optional equipment might have minor variations in routing. Always refer to your vehicle's specific under-hood diagram or take a photo before removal.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2015 Chevrolet Suburban is a manageable DIY task for those with some mechanical aptitude. You will need a serpentine belt tool or a 3/8" drive breaker bar.

1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery terminal to prevent accidental starting.
2. Locate the Tensioner: Identify the automatic belt tensioner. It will have a square hole (usually 3/8-inch) for your tool.
3. Release Tension: Insert your serpentine belt tool or 3/8" breaker bar into the square hole on the tensioner. Rotate the tensioner counter-clockwise (or clockwise, depending on its design) to relieve tension on the belt.
4. Remove the Old Belt: While holding the tensioner in the loosened position, carefully slip the belt off one of the pulleys (the idler pulley is often the easiest starting point).
5. Inspect Pulleys: Once the old belt is removed, spin each pulley by hand to check for any excessive play, grinding noises, or resistance, which could indicate a failing bearing. Also, inspect the pulleys for any damage or wear.
6. Route the New Belt: Referring to your photograph or the under-hood diagram, carefully route the new belt around all pulleys, leaving one pulley (again, the idler is usually easiest) off for last.
7. Apply Tension: Again, use your serpentine belt tool or breaker bar to rotate the tensioner, allowing enough slack to slip the belt over the final pulley.
8. Release Tensioner: Slowly release the tensioner, allowing it to apply proper tension to the new belt.
9. Double-Check Routing: Visually inspect to ensure the belt is correctly seated in all pulley grooves and follows the correct path.
10. Reconnect Battery & Test: Reconnect the negative battery terminal. Start the engine and let it run for a few minutes, listening for any squealing or unusual noises. Turn the steering wheel lock-to-lock a few times to ensure the power steering operates correctly. Check the A/C for proper function.

Replacement Interval

Most manufacturers recommend inspecting the serpentine belt every 50,000 miles or 5 years and replacing it every 75,000–100,000 miles or sooner if inspection reveals signs of wear. However, always consult your vehicle's owner's manual for the specific recommended maintenance schedule.

Signs of a Failing Belt or Tensioner

Don't wait for a complete belt failure, which can leave you stranded. Be aware of these warning signs:

• Squealing or Chirping Noises: This is one of the most common indicators, especially on cold starts or when turning the steering wheel (power steering pump) or engaging the A/C.
• Cracks, Fraying, or Glazing: Visually inspect the belt's ribbed surface for any signs of wear and tear. Cracks, missing chunks, or a shiny, glazed appearance indicate it's time for a replacement.
• Loss of Power Steering: If the power steering feels heavy or difficult to turn, especially at low speeds, the belt might be slipping or broken.
• Overheating Engine: A broken or slipping belt can prevent the water pump from circulating coolant, leading to engine overheating.
• Battery Light On: If the alternator isn't turning due to a slipping or broken belt, the battery won't charge, and the battery warning light will illuminate on your dashboard.
• A/C Not Working: If the A/C compressor isn't being driven by the belt, your air conditioning will not blow cold air.
• Wobbling or Vibrating Tensioner/Pulleys: A failing tensioner might wobble excessively while the engine is running, or the tensioner arm may not hold proper tension. Pulleys with bad bearings can also wobble or make grinding noises.

If you notice any of these symptoms, it's crucial to address the issue promptly to prevent further damage or an inconvenient breakdown.

Find a trusted shop on Repairius.