2017 Chevrolet Suburban Serpentine Belt Guide

Quick Answer

For the 2017 Chevrolet Suburban equipped with the 5.3L V8 engine, here are the key specifications and part numbers for the main serpentine drive belt. Note that a second, smaller belt is often used for the A/C compressor. Always confirm part numbers with your VIN at the dealership or with your parts supplier before purchase as variations can exist.

• Main Drive Belt Length: Approximately 90.5 inches (2299mm)
• Main Drive Belt Rib Count: 6-rib
• OEM GM Belt PN: 12658145
• Aftermarket Cross-References:
  • Gates: K060905
  • Dayco: 5060905
  • Continental: 4060905
• Auto-Tensioner Assembly PN: 12690345 (OEM)
• Idler Pulley PN: 12690352 (OEM, for the smooth idler)

Belt Routing

The 2017 Suburban with the 5.3L V8 uses a fairly straightforward serpentine belt path for the main drive system. Before you remove the old belt, we highly recommend taking a clear photograph of the belt's routing from a couple of different angles. This will be your best guide and prevent frustration during installation.

Here is the step-by-step path the belt takes, starting from the crankshaft pulley at the bottom center of the engine:

1. The belt comes up from the Crankshaft Pulley.
2. It wraps around the A/C Compressor pulley.
3. From the A/C, the belt travels down and around the Idler Pulley.
4. Next, it goes up and over the Alternator pulley.
5. It then moves across to the Power Steering Pump pulley.
6. The belt then routes down and around the grooved side of the Water Pump pulley.
7. Finally, the backside (smooth side) of the belt wraps under the Tensioner Pulley, which applies the proper tension to the entire system.

Again, a photo of your specific vehicle's setup is invaluable.

How to Replace the Serpentine Belt

Replacing the serpentine belt is a manageable task for a DIYer with the right tool. You will need a serpentine belt tool, which is a long, thin bar with various socket attachments, or a long-handled 3/8" drive breaker bar.

1. Safety First: Make sure the engine is cool. It's always a good practice to disconnect the negative battery terminal.
2. Locate the Tensioner: The automatic tensioner is located between the water pump and the alternator. It has a pulley attached to a spring-loaded arm and a square hole for your tool.
3. Release Tension: Fit your serpentine belt tool or 3/8" breaker bar into the square hole on the body of the tensioner assembly. Rotate the tensioner arm—usually clockwise—to release the tension on the belt.
4. Remove the Old Belt: While holding the tensioner, carefully slip the old belt off one of the smooth pulleys (like the idler). Once it's off one pulley, you can slowly release the tensioner and remove the belt the rest of the way.
5. Route the New Belt: Following your photo or the routing description above, carefully thread the new belt around all the pulleys, leaving an easy-to-reach pulley like the idler or alternator for last. Double-check that the belt is properly seated in the grooves of each ribbed pulley.
6. Apply Tension: Using your tool, rotate the tensioner arm again and carefully slide the new belt over the final pulley.
7. Final Check: Once the belt is on, slowly release the tensioner and watch to make sure the belt tracks correctly on all pulleys. Give the belt a final inspection to ensure it is not twisted and is correctly seated in all grooves. Reconnect the battery.

Replacement Interval

General Motors recommends inspecting the serpentine belt at regular service intervals (every 15,000 to 30,000 miles) and replacing it as needed. While there isn't a strict mileage for replacement, most modern belts last between 60,000 and 100,000 miles. Given the age of a 2017 model, if your Suburban is approaching or has exceeded this mileage on its original belt, it's wise to replace it proactively to avoid a breakdown.

Signs of a Failing Belt or Tensioner

A failed serpentine belt will leave you stranded, as it drives critical components like the alternator (charging system), water pump (engine cooling), and power steering pump. Watch for these warning signs:

• Squealing or Chirping Noises: This is the classic sign of a worn, glazed, or misaligned belt. The noise may be more prominent on cold starts or in wet weather.
• Visible Wear: Inspect the belt for cracks, fraying, missing ribs, glazing (shiny spots), or contamination from oil or coolant. Any visible damage warrants immediate replacement.
• Tensioner Issues: If the tensioner pulley is bouncing or vibrating excessively while the engine is running, its internal spring is likely weak. A seized tensioner pulley bearing will often make a grinding or rumbling noise. A failed tensioner can destroy a new belt quickly.
• Accessory Problems: Dimming headlights (alternator), difficulty steering (power steering), or engine overheating (water pump) can all be symptoms of a slipping or broken belt.

If you're not comfortable tackling this job yourself, or if you suspect a more significant issue with the tensioner or a pulley, don't hesitate to seek professional help.

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