2025 Toyota RAV4 Serpentine Belt Routing, Length & Part Numbers

As an ASE-certified master technician, I regularly field questions about drive belt maintenance on modern SUVs. For the 2025 Toyota RAV4, it's critical to note your specific powertrain before popping the hood. Note: If you drive a RAV4 Hybrid or RAV4 Prime (PHEV), your vehicle does not have a serpentine belt. The hybrid systems use electric motors for the air conditioning compressor, water pump, and power steering.

However, if you drive the traditional gas-powered 2025 Toyota RAV4 (2.5L 4-Cylinder A25A-FKS engine), you have a single serpentine belt responsible for driving the alternator and the A/C compressor. The water pump and power steering are electronic, resulting in a relatively short and straightforward belt system.

Here is everything you need to know about replacing the serpentine belt on your 2025 Toyota RAV4.

Quick Answer: Specifications & Part Numbers

• Engine: 2.5L 4-Cylinder Gas (A25A-FKS)
• Belt Length: 48.5 inches (approximate)
• Rib Count: 6-rib
• OEM Toyota Belt Part Number: 90916-02755
• Aftermarket Cross-References: Gates K060485, Dayco 5060485, Continental 4060485
• OEM Auto-Tensioner Part Number: 16620-25020 (often includes the pulley)
• Idler Pulley Part Number: Not applicable (the 2.5L gas engine routing relies on the tensioner pulley rather than a separate stationary idler).

Belt Routing

Pro Tip: Always use your smartphone to take a clear, well-lit photograph of the existing belt routing before you remove it. It will save you a headache later!

Because the 2025 gas RAV4 uses an electric water pump and electronic power steering (EPS), the belt routing is exceptionally simple compared to older vehicles. The routing path goes as follows:

1. Crankshaft Pulley (Bottom Center): The ribbed side of the belt wraps around the bottom of the main crank pulley.
2. A/C Compressor (Lower Front): The belt runs up from the crankshaft to wrap around the A/C compressor pulley with the ribbed side.
3. Alternator (Upper Front): From the A/C compressor, the belt travels up to the alternator pulley, again engaging the ribbed side.
4. Auto-Tensioner (Center Left): The smooth back side of the belt loops down around the smooth pulley of the automatic tensioner before returning to the crankshaft.

How to Replace the Serpentine Belt

Replacing the belt on the 2.5L gas RAV4 is a relatively quick job if you have the right tools and access.

Tools Needed:

• Serpentine belt tool or a long 3/8-inch drive breaker bar
• 14mm socket (depending on the specific tensioner bolt head)
• Flashlight or work light
• Safety glasses and gloves

Step-by-Step Replacement:

1. Locate the tensioner: Find the automatic tensioner pulley located between the alternator and the crankshaft pulley.
2. Release the tension: Fit your breaker bar or serpentine belt tool onto the tensioner pulley bolt. Slowly rotate the tensioner counter-clockwise (towards the front of the vehicle) to relieve the tension on the belt.
3. Remove the old belt: While holding the tensioner open, slip the old belt off the alternator pulley (usually the easiest one to reach). Slowly release the tensioner back to its resting position. Remove the belt from the remaining pulleys.
4. Route the new belt: Guide the new belt down around the crankshaft, up around the A/C compressor, and then to the alternator. Leave the loop for the tensioner for last. Ensure the ribs are perfectly seated in the grooves of all the ribbed pulleys.
5. Engage the tensioner: Turn the tensioner counter-clockwise again, slip the smooth side of the belt under the tensioner pulley, and gently release the tensioner to apply pressure to the belt.
6. Verify: Double-check every pulley with a flashlight to ensure the belt is seated properly and isn't hanging off an edge. Start the engine and observe the belt for a few seconds to ensure smooth operation.

Replacement Interval

Toyota generally recommends inspecting the drive belt every 15,000 miles or 18 months. Under normal driving conditions, EPDM serpentine belts typically last between 60,000 and 90,000 miles. However, age can degrade the rubber just as much as mileage, so if your vehicle is 5–7 years old, it’s a good idea to swap it out preventatively.

Signs of a Failing Belt or Tensioner

Don't wait for the belt to snap and leave you stranded. Look out for these common warning signs:

• Squealing or Chirping Noises: High-pitched sounds on startup or under heavy acceleration often indicate a stretched belt or a weak automatic tensioner spring.
• Visible Wear: Look for cracks, fraying edges, missing ribs, or a shiny, glazed appearance on the ribbed side of the belt.
• Accessory Malfunctions: If your A/C stops blowing cold or you get a battery/charging system warning light on the dashboard, a slipping or broken belt could be the culprit.
• Tensioner Rattle: If the tensioner pulley bearing is failing, you may hear a grinding or rattling noise from the side of the engine block.

Need help replacing your belt or diagnosing a strange engine noise? Find a trusted shop on Repairius.