Mitsubishi Eclipse Serpentine and Accessory Belt Replacement (2000-2006)
This guide covers the essential details for replacing the accessory drive belts on your 2000-2006 Mitsubishi Eclipse.
- Verify your exact year and engine before buying. 2000-2005 2.4L models use two belts; V6 and all 2006 models use one.
- A squealing noise is the first warning sign; inspect the belt immediately for cracks or wear.
- Plan to replace the belt tensioner(s) and idler pulleys at the same time as the belt for long-term reliability.
- On 2.4L models (2000-2005), a failed belt will cause the engine to overheat. Pull over immediately if this happens.
Understanding Your Eclipse's Belt System: 2000-2005 vs. 2006
CRITICAL: The 2000-2006 Eclipse spans two different vehicle generations (3G and 4G) with different engines and belt systems. Ordering the correct part requires knowing your specific year and engine.
- 2000-2005 Eclipse (3rd Gen): These models have different belt setups depending on the engine.
- 2.4L 4-Cylinder: Uses two separate accessory belts. One belt drives the alternator and water pump 🎬 Watch: Step-by-step guide to replacing the 3G alternator belt., while a second belt drives the power steering pump and A/C.
- 3.0L V6: Uses a single serpentine belt to run all accessories (alternator, power steering, A/C). The water pump is driven by the timing belt.
- 2006 Eclipse (4th Gen): This model year uses a single serpentine belt for all accessories on both the 2.4L 4-cylinder and 3.8L V6 engines. The tensioner is also a modern, spring-loaded automatic design, which is easier to work with than the manual tensioners on 3rd Gen models.
Signs of a Failing Serpentine Belt
A failing belt gives clear warning signs. Ignoring them can leave you stranded. Look and listen for these symptoms:
- Squealing Noises: A high-pitched squeal from the engine bay, especially on startup or when turning the steering wheel, is the most common sign of a worn or loose belt.
- Visible Wear: Inspect the belt for cracks, glazing (shiny surface), fraying, or missing ribs. Any visible damage means it's time for a replacement.
- Accessory Failure: If your power steering becomes heavy, the battery light comes on, or the A/C stops blowing cold, the belt may have snapped or is slipping badly.
- Overheating Engine: On 2.4L models from 2000-2005, the belt drives the water pump. If the engine temperature rises quickly, the belt may have failed, causing the cooling system to stop working.
Choosing the Right Aftermarket Belt
For a part like a serpentine belt, you don't need to pay extra for a dealership OEM part. High-quality aftermarket brands offer the same, if not better, performance and durability for your Eclipse. Brands like Continental, Dayco, and Gates are trusted by professional mechanics and are excellent choices. They are made from modern EPDM rubber compounds that resist cracking and heat better than older neoprene belts. The most important factor is ensuring you buy the correct belt(s) for your specific year and engine configuration.
Pro Tip: While replacing your belt(s), it is highly recommended to inspect the tensioner and idler pulleys. Spin them by hand. If they feel rough, make noise, or wobble, they should be replaced at the same time to prevent the new belt from failing prematurely.
Replacement Cost
Replacing the serpentine belt on a 2000-2006 Eclipse is an affordable repair. Prices vary based on your engine and which generation your car is.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Belt(s) | $12.45 - $47.05 |
| Shop Labor | $60 - $90 |
| Total Estimated Cost | $75 - $140 |
Frequently Asked Questions (FAQ)
How often should I replace my Eclipse's serpentine belt?
A general rule is to inspect the belt during every oil change and plan for replacement every 60,000 to 100,000 miles, or as soon as you notice any signs of wear like cracking or squealing. Given the age of these vehicles, it's wise to replace it if you don't have a record of it being done.
Should I replace the tensioner with the belt?
It's a very good idea, especially on higher-mileage vehicles. A weak or failing tensioner is a common cause of belt noise and can cause a new belt to fail quickly. On 3rd Gen models with manual tensioners, the hardware can seize, and on 4th Gen models, the spring can weaken. Replacing them together is preventative maintenance.
Is the serpentine belt the same as the timing belt?
No, they are completely different. The serpentine/accessory belt runs components on the outside of the engine. The timing belt is located behind a protective cover and synchronizes the engine's internal components. Both the 4-cylinder and V6 engines in this generation of Eclipse are interference engines, meaning if the timing belt breaks, catastrophic engine damage will occur. The timing belt has its own separate, and much more critical, service interval (typically every 60,000 miles).
How many belts do I need for my 2003 Eclipse?
This depends entirely on your engine. If you have the 2.4L 4-cylinder, you will need two separate accessory belts. If you have the 3.0L V6, you only need one serpentine belt. Always verify your engine before ordering parts.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1340A005 (For 2000-2005 2.4L - Alternator/Water Pump Belt) MD374873 (For 2000-2005 2.4L - Power Steering/AC Belt) MN158101 (For 2006 3.8L V6)
The 2000-2005 3rd Generation models use a manual belt tensioner system that requires loosening a lock bolt and turning an adjustment bolt. The 2006 4th Generation model uses a spring-loaded automatic tensioner that is released with a standard breaker bar or serpentine belt tool.
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.
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