2020 Chevrolet Silverado 1500 Serpentine Belt: Routing, Replacement, & Part Numbers

Quick answer:

• Belt Length: Varies by engine – see below for specific engines.
• Rib Count: 6-rib
• **OEM Belt PNs (Example - confirm for your specific engine):
  • 6.2L L87 & 5.3L L84 (with RPO KNP heavy-duty air filter): GM PN 12695503
  • 5.3L L84 & 4.3L LV3 (without RPO KNP heavy-duty air filter): GM PN 12678859
• **Aftermarket Cross-References (confirm for your specific engine and OEM PN):
  • Gates K060867 (for GM PN 12695503)
  • Dayco 5060865 (for GM PN 12695503)
  • Continental Elite 4060867 (for GM PN 12695503)
  • Gates K060855 (for GM PN 12678859)
  • Dayco 5060855 (for GM PN 12678859)
  • Continental Elite 4060855 (for GM PN 12678859)
• **Auto-Tensioner PNs (Example - confirm for your specific engine):
  • 6.2L L87 & 5.3L L84: GM PN 12678860
  • 4.3L LV3: GM PN 12638848
• **Idler Pulley PNs (Example - confirm for your specific engine):
  • 6.2L L87 & 5.3L L84: GM PN 12622442
  • 4.3L LV3: GM PN 12673322

The serpentine belt on your 2020 Chevrolet Silverado 1500 is a critical component, driving essential accessories like your alternator, power steering pump, air conditioning compressor, and water pump. Understanding its routing, replacement interval, and signs of wear can save you from unexpected breakdowns and costly repairs. This guide provides an in-depth look at everything you need to know about the serpentine belt for your Silverado 1500.

Belt Routing

IMPORTANT: Before removing your existing serpentine belt, take several clear photos of its routing. This will be an invaluable visual aid during installation, especially given potential variations in accessory placement.

The 2020 Chevrolet Silverado 1500 can come with various engine options, which may lead to slight variations in belt routing. However, a common routing path for the primary serpentine belt generally follows this pattern. Always refer to your under-hood diagram if available, or your service manual for the most accurate routing for your specific engine.

Below is a generalized step-by-step text description for common V8 engines (e.g., 5.3L L84, 6.2L L87) and V6 engines (e.g., 4.3L LV3). The exact configuration might vary slightly based on specific options like heavy-duty air filters (RPO KNP) or other accessory drives.

1. Crankshaft Pulley: The belt starts at the large, lowest pulley on the engine, the crankshaft pulley, which drives all other accessories.
2. A/C Compressor: From the crankshaft pulley, the belt typically runs down to the air conditioning (A/C) compressor pulley, usually located on the lower passenger side of the engine.
3. Idler Pulley: After the A/C compressor, the belt often runs up and over an idler pulley. This pulley is smooth and serves to guide the belt and maintain proper tension and contact with other pulleys.
4. Alternator: From the idler pulley, the belt usually travels up to the alternator pulley, often located towards the top or middle-upper section of the engine on the passenger side.
5. Power Steering Pump: The belt then typically wraps around the power steering pump pulley, which might be located on the driver's side or upper middle section of the engine.
6. Water Pump: Next, the belt usually goes around the water pump pulley, which is generally centrally located on the front of the engine, often with a large, flat surface.
7. Auto-Tensioner: Finally, the belt usually passes under or over the automatic belt tensioner. This component applies constant tension to the belt, ensuring proper grip on all pulleys. The tensioner often has a square hole for a serpentine belt tool or a 3/8-inch breaker bar to release tension for belt removal/installation.

How to Replace the Serpentine Belt

Replacing a serpentine belt on your 2020 Silverado 1500 is a moderately challenging DIY task. Always ensure the engine is off and cool before starting work.

Tools Needed:

• Serpentine belt tool or a long 3/8-inch drive breaker bar or ratchet.
• Socket (if the tensioner has a nut instead of a square drive).
• New serpentine belt.
• Flashlight (optional).

Steps:

1. Safety First: Ensure the vehicle is in Park (automatic) or Neutral (manual) with the parking brake engaged. The engine must be off and cool.
2. Document Routing: Take multiple photos of the existing belt's routing from different angles. This is crucial for correct installation.
3. Locate Tensioner: Identify the automatic belt tensioner. It will have a pivot point and a spring mechanism. Most modern tensioners for your Silverado will have a square hole designed for a 3/8-inch drive tool or a specialized serpentine belt tool.
4. Relieve Tension: Insert your serpentine belt tool or breaker bar into the square hole on the tensioner. Slowly rotate the tensioner to release the tension on the belt. This will allow you to slip the belt off one of the smooth pulleys.
5. Remove Old Belt: Once tension is relieved, carefully slip the belt off one or more pulleys and then completely remove it from the engine compartment.
6. Inspect Pulleys and Tensioner: While the belt is off, manually spin each pulley (alternator, power steering, A/C, idlers). They should spin freely with no grinding noises or excessive play. Check the tensioner for proper spring tension and smooth operation. If any pulley feels rough or wobbly, it should be replaced.
7. Install New Belt: Route the new belt exactly as documented in your photos. Start by placing it around all the stationary pulleys (crank, A/C, alternator, power steering, water pump, idlers) first. The last pulley to route it over should be the tensioner or an easily accessible smooth idler.
8. Apply Tension: Again, use your serpentine belt tool or breaker bar to release the tensioner and carefully slip the final section of the belt onto the last pulley. Slowly release the tensioner.
9. Verify Routing: Once installed, double-check that the belt is correctly seated in all the grooves of every ribbed pulley and is squarely on all smooth pulleys.
10. Start Engine: Start the engine briefly and listen for any unusual noises (squealing, chirping). Observe the belt's path to ensure it runs smoothly and doesn't appear to be walking off any pulleys. Turn the engine off and re-check all pulleys and the belt's position.

Replacement Interval

Chevrolet generally recommends inspecting the serpentine belt during routine maintenance. While there isn't a strict mileage-based replacement interval like there is for timing belts, a good rule of thumb is to consider replacement every 60,000 to 100,000 miles or sooner if signs of wear are observed. Environmental factors, driving habits, and engine compartment temperatures can all affect belt life. It's always best to replace the belt before it fails, as a sudden failure can leave you stranded and potentially damage other components.

Signs of a Failing Belt or Tensioner

Being aware of the symptoms of a worn serpentine belt or a failing tensioner can prevent unexpected breakdowns:

• Squealing or Chirping Noises: This is the most common sign. A loose, worn, or cracked belt will often make squealing or chirping sounds, especially on startup, in wet weather, or when revving the engine. This can also indicate a failing tensioner or misaligned pulley.
• Visible Cracks or Fraying: Inspect the belt for any visible cracks, fraying, missing ribs, or glazing (a shiny, hardened appearance). These are clear indicators that the belt is past its prime.
• Loss of Power Steering: If your power steering suddenly becomes difficult, especially at low speeds, it could mean the belt is slipping or has broken, no longer driving the power steering pump.
• Overheating Engine: A broken serpentine belt will stop the water pump from circulating coolant, leading to rapid engine overheating.
• Battery Light On / Dead Battery: If the belt isn't driving the alternator, your battery won't charge, leading to a dead battery and the battery warning light illuminating on your dash.
• A/C Not Working: A broken or severely slipping belt will prevent the A/C compressor from engaging.
• Growling or Grinding from Pulleys: If you hear growling or grinding noises, especially when the engine is running, it could indicate a failing idler pulley, tensioner pulley, or one of the accessory pulleys.
• Belt Slippage: If you notice the belt appears to be slipping on any of the pulleys, it could be due to a worn belt, a weak tensioner, or a contaminated belt surface.

If you experience any of these symptoms, it's crucial to inspect your serpentine belt system immediately.

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