Accessory Drive Belt Guide for the 1982-1990 GMC S15
Keep your classic S15 running strong by choosing the right accessory drive belts for your specific engine.
- First, identify if your S15 has multiple V-belts (common on pre-1987 models) or a single serpentine belt (common on 1987+ models).
- Symptoms like squealing noises, visible cracks, or dimming headlights are clear signs that your belts need inspection and likely replacement.
- For this age of vehicle, quality aftermarket brands like Gates, Continental, and ACDelco offer excellent performance and durability.
- If you have a serpentine belt, consider replacing the belt tensioner and idler pulleys at the same time to prevent future issues.
Understanding Your S15's Belt System: V-Belt vs. Serpentine
One of the most important things to know when buying belts for a 1982-1990 GMC S15 is that two different systems were used during this period. It is crucial to identify which system your truck has before ordering parts.
- V-Belts (Primarily 1982-1986): Early S15 models, typically those from 1982 to around 1986, use a multiple V-belt system. This means you will have several individual belts, each potentially driving one or two accessories. These belts are V-shaped in cross-section and sit in deep grooves on the pulleys. While reliable, they require individual tensioning and can be more complex to replace.
- Serpentine Belts (Primarily 1987-1990): Later models, especially those with the 2.8L V6 and 4.3L V6 engines from roughly 1987 onward, switched to a single serpentine belt. This is a wide, flat belt with multiple ribs that drives all accessories at once. This system uses a spring-loaded tensioner to keep the belt tight automatically, making replacement simpler.
Pro Tip: The easiest way to know what you have is to open the hood. If you see multiple, separate belts, you have V-belts. If you see one wide, ribbed belt snaking around all the pulleys, you have a serpentine belt.
Symptoms of a Failing Accessory Drive Belt
A worn-out belt gives clear warning signs before it fails completely. Ignoring them can lead to a breakdown and potentially more expensive repairs.
- Squealing Noises: A high-pitched squeal, especially on startup, during sharp turns, or when the A/C kicks on, is the most common symptom. This is caused by the belt slipping on the pulleys.
- Visible Wear and Tear: Inspect your belts. Look for cracking, fraying, glazing (a shiny, smooth surface), or missing chunks of rubber. For serpentine belts, check for cracks in the ribs.
- Accessory Malfunctions: If your battery light comes on, your power steering becomes heavy, or the engine temperature starts to rise, it could be due to a slipping or broken belt.
- Stuck Tensioner: On serpentine systems, a tensioner pulley can seize, preventing it from keeping the belt tight. This can cause squealing or the belt to come off.
Choosing the Right Aftermarket Belt Brand
For a vehicle like the 1982-1990 S15, original OEM belts are likely discontinued or hard to find. However, modern aftermarket belts from reputable brands often meet or exceed the quality of the original parts from decades ago. Belt technology has improved, offering better durability and performance.
Here’s a breakdown of trusted brands:
- Premium Brands (Best Quality):
- Gates: Long considered an industry leader and an OEM supplier for many manufacturers. Gates belts are known for their durability and precise fit.
- Continental: Another top-tier brand that is also an OEM supplier. They are praised for quiet operation and reliability.
- ACDelco: As GM's own parts brand, ACDelco offers both original equipment and high-quality aftermarket "Professional" grade belts that are a trusted choice for any S15.
- Standard/Reliable Brands (Good Value):
- Dayco: A well-known brand that offers a good balance of performance and price. They are a solid choice for daily drivers.
- Bando: An OEM supplier for many Japanese vehicles, Bando also produces high-quality belts for domestic applications and is known for its manufacturing quality.
A Note on Quality: While all the listed brands are reputable, some users in forums have noted occasional quality control issues across all brands. Always inspect a new belt for visible defects before installation. For a classic truck like the S15, any of these brands will provide reliable service when installed correctly.
Accessory Drive Belt Cost for 1982-1990 GMC S15
| Part Category | Estimated Cost Range |
|---|---|
| New Aftermarket Belts | $2.60 - $63.51 (per belt, price varies by brand and V-belt vs. serpentine) |
| Shop Labor to Replace | $75 - $150 (depending on V-belt complexity or serpentine) |
Frequently Asked Questions (FAQ)
How many belts does my 1982-1990 S15 have?
It depends on the year and engine. Models from 1982 to roughly 1986 typically have a multi-belt (V-belt) setup with 2 to 4 separate belts. Models from 1987-1990, especially with V6 engines, usually have a single serpentine belt. Always verify by checking your specific truck.
Can I replace the accessory drive belts myself?
Yes, this is a very DIY-friendly job for most home mechanics. Replacing a single serpentine belt is often easier, requiring only a ratchet or serpentine belt tool to release the tensioner. V-belts are also straightforward but require loosening individual accessories to adjust tension. There are many online videos demonstrating the process for similar GM trucks.
Should I replace the tensioner with the serpentine belt?
If your truck has a serpentine belt with high mileage, it is highly recommended to replace the tensioner and any idler pulleys at the same time. The spring in the tensioner can weaken over time, and the pulley bearings can wear out, causing noise or belt failure. It's cheap insurance to do it all at once.
Were there any recalls for the S15 accessory drive belt?
No specific recalls related to the accessory drive belts were found for the 1982-1990 GMC S15 in the NHTSA database. Any issues are typically related to normal wear and tear.
Technical Specifications
Belt type is either V-Belt (multiple belts, V-shaped) or Serpentine (single flat, ribbed belt). The specific length and number of ribs/belts depend entirely on the engine (1.9L, 2.0L, 2.5L, 2.8L, 4.3L) and installed accessories (A/C, power steering). Always verify the part with your vehicle's specific configuration.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC S15: