🔧 Altima - Serpentine Belt Replacement

The serpentine belt drives accessories like the alternator and A/C. On your Altima, the belt is held tight by an automatic spring-loaded tensioner, so the job is mainly about safely releasing tension, swapping the belt, and confirming the routing is correct.

Difficulty Level: Intermediate | Estimated Time: 0.5-1.5 hours

---

⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; keep hands clear of pulleys and fans.
• ⚠️ Support the car with jack stands; never rely on a floor jack alone.
• ⚠️ Do not start the engine while your hands are near the belt path.
• ⚠️ If you remove the right-front wheel, keep the car on level ground and use wheel chocks.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Lug nut socket 21mm
• Ratchet 3/8"
• Breaker bar 3/8" or 1/2"
• Serpentine belt tool (specialty)
• Socket 14mm
• Socket 15mm
• Socket 17mm
• Extension 6"
• Trim clip remover
• Flathead screwdriver
• Work light
• Gloves
• Safety glasses

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1
• Fender liner / splash shield clips - Qty: 2-6

---

📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Open the hood and find the belt routing diagram (usually on the radiator support or underside of the hood). If it’s missing, take a clear photo of the current routing before removing the belt.
• Plan access: on the 2.5L, belt access is usually easiest from the right-front wheel well.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise the right-front corner for access

• Use a 21mm lug nut socket and breaker bar to loosen the right-front lug nuts 1/2 turn (don’t remove them yet).
• Lift the right-front using a floor jack, then support it with jack stands.
• Remove the wheel using the 21mm lug nut socket.

Step 2: Remove the splash shield / fender liner section

• Use a trim clip remover and flathead screwdriver to remove the plastic clips/screws from the front of the right fender liner (the small access section near the crank pulley area).
• Pull the liner back enough to clearly see the belt, pulleys, and tensioner. Use a work light for visibility.

Step 3: Confirm belt routing before removal

• Compare what you see to the under-hood routing diagram, or use your phone to take a picture.
• Photo first; it prevents routing mistakes.

Step 4: Release tension from the automatic tensioner

• The tensioner is a spring-loaded arm that keeps the belt tight automatically (you rotate it to slacken the belt).
• Place a serpentine belt tool (specialty) or breaker bar on the tensioner’s drive point.
• On many Altima 2.5 setups, the drive point is the bolt head on the tensioner pulley. Use the socket that fits your tensioner: 14mm socket or 15mm socket or 17mm socket with a ratchet 3/8" and extension 6".
• Rotate the tensioner smoothly to create slack, then slide the belt off the easiest-to-reach top pulley using your free hand.
• Slowly let the tensioner return to rest. Do not let it “snap” back.

Step 5: Remove the old belt

• Pull the belt out through the wheel well opening.
• Inspect each pulley by hand for wobble or roughness (alternator, idler, tensioner pulley, A/C). If any pulley feels gritty, noisy, or loose, stop and address that before installing a new belt.

Step 6: Install the new belt (route it correctly)

• Route the new belt around the pulleys using the under-hood diagram. Start at the crankshaft pulley (the large lower pulley) and work your way around.
• Keep the belt fully seated in every grooved pulley as you go (the ribs must sit in the grooves).
• Leave the easiest pulley for last (often a smooth idler or the alternator pulley depending on access).

Step 7: Apply tension and slip the belt onto the last pulley

• Use the serpentine belt tool (specialty) or breaker bar with the correct socket (14mm or 15mm or 17mm) to rotate the tensioner and create slack again.
• Slide the belt onto the final pulley, then slowly release the tensioner so it tensions the belt.
• Do a final visual check: the belt should be centered on smooth pulleys and perfectly seated in the grooves on ribbed pulleys.

Step 8: Reinstall splash shield and wheel

• Reposition the liner and reinstall clips using a trim clip remover and flathead screwdriver.
• Install the wheel and hand-thread lug nuts.
• Lower the car off the jack stands using the floor jack.
• Tighten lug nuts in a star pattern using a 21mm lug nut socket to Torque to 113 Nm (83 ft-lbs).

---

✅ After Repair

• Start the engine and watch the belt for 15–30 seconds. It should run smooth with no hopping, squealing, or wandering.
• Turn the A/C on and off and listen for noise changes. A brief chirp can mean the belt isn’t seated in a groove.
• Shut the engine off and re-check belt seating one more time with your work light.

---

💰 DIY vs Shop Cost

Shop Cost: $140-$280 (parts + labor)

DIY Cost: $20-$60 (parts only)

You Save: $120-$220 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

---

🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.