🔧 Sequoia - Serpentine Belt Replacement

On your Sequoia, the serpentine belt (also called the drive belt) runs the alternator, A/C, and other accessories. Replacing it is a straightforward job, but the belt routing must be correct so it doesn’t squeal or come off.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; keep hands away from the fan and pulleys.
• ⚠️ Remove the key and keep it away so nobody can start the engine.
• ⚠️ Keep loose clothing/hair clear of the belt path.
• Battery disconnect is not required, but it’s OK to disconnect the negative terminal if you want extra safety.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8" drive ratchet
• 14mm socket
• 3/8" drive breaker bar
• Trim clip removal tool
• Flashlight
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and use a flashlight to find the belt routing diagram (often on a sticker near the radiator support or underside of the hood).
• If the routing sticker is missing, take a clear photo of the belt path before removing anything.
• Tip: Draw a quick sketch of the belt route.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a trim clip removal tool to carefully pop up any retaining clips if your cover uses them.
• Lift the cover straight up and set it aside.

Step 2: Locate the belt tensioner

• Use a flashlight to find the automatic belt tensioner (a spring-loaded arm with a pulley).
• The tensioner has a hex boss for a tool—this is where your 14mm socket fits.
• “Tensioner” means the spring-loaded part that keeps the belt tight automatically.

Step 3: Release belt tension

• Install the 14mm socket on a 3/8" drive ratchet or 3/8" drive breaker bar.
• Rotate the tensioner to relieve tension (it will feel strong—this is normal).
• While holding the tensioner rotated, slide the belt off one easy-to-reach pulley (usually the smooth idler or alternator pulley).
• Slowly return the tensioner to its resting position—do not let it snap back.

Step 4: Remove the old belt

• Pull the belt out of the remaining pulleys by hand.
• Use a flashlight to inspect pulleys for cracks, wobble, or rough spinning.
• Tip: A noisy pulley can ruin a new belt.

Step 5: Route the new belt

• Compare the new belt to the old belt length and rib count before installing.
• Route the belt following the under-hood routing diagram (or your photo).
• Make sure the ribbed side of the belt sits fully in the grooves of ribbed pulleys.
• Make sure the smooth side of the belt rides on smooth pulleys.

Step 6: Apply tension and seat the belt

• Use the 14mm socket with the 3/8" drive breaker bar to rotate the tensioner again.
• Slip the belt over the last pulley.
• Slowly release the tensioner back into place.
• Use a flashlight to confirm the belt is centered on every pulley and fully seated in the grooves.

Step 7: Reinstall the engine cover

• Reinstall the cover and any clips using the trim clip removal tool as needed.

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✅ After Repair

• Start the engine and watch the belt for 10–20 seconds from a safe distance.
• Listen for chirping/squealing; if you hear it, shut the engine off and re-check belt routing and seating.
• Recheck the belt position one more time with the engine off.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $35-$80 (parts only)

You Save: $100-$300 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.

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🎯 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.