🔧 Outback - Serpentine Belt Replacement

The serpentine belt (also called the accessory drive belt) runs your alternator and A/C. If it’s cracked, squealing, or glazed, replacing it prevents charging problems and belt failure.

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

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⚠️ Safety & Precautions

• 🧤 Work on a cool engine; keep hands clear of pulleys and fans.
• 🛑 Key OFF and remove the key/fob from the vehicle area.
• 🧥 Avoid loose clothing/hair near rotating parts.
• 🔋 Battery disconnect is not required, but never crank the engine while your hands are in the belt area.

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🔧 Required Tools

You'll need the following tools for this repair:

• 14mm socket
• 3/8" drive ratchet
• 3/8" drive breaker bar (18" minimum)
• 3/8" drive extension set (3" and 6")
• Trim clip removal tool
• Flashlight
• Mechanic gloves
• Safety glasses
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt (accessory drive belt) - Qty: 1

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📋 Before You Begin

• 🧱 Park on level ground, shift to Park, and set the parking brake.
• 🧰 Let the engine cool fully so you don’t burn your hands.
• 📸 Take a quick photo of the belt routing, or locate the belt-routing sticker under the hood (if equipped).
• 🛞 If access is tight from above, raise the front safely: use wheel chocks, lift with a floor jack, and support with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Get access to the belt

• Open the hood and use a flashlight to find the belt path at the front of the engine.
• If needed, remove the lower splash shield clips using a trim clip removal tool (this gives you better access from underneath).

Step 2: Relieve tension with the automatic tensioner

• Locate the belt tensioner pulley. The tensioner is spring-loaded (it automatically keeps the belt tight).
• Place a 14mm socket on the tensioner’s hex/bolt head and attach a 3/8" drive breaker bar with a 3/8" drive extension if needed.
• Rotate the breaker bar smoothly to relieve belt tension (you are fighting a strong spring).
• Tip: Move slowly—don’t let it snap back.

Step 3: Remove the old belt

• While holding the tensioner rotated with the breaker bar, use your free hand (with mechanic gloves) to slip the belt off the easiest-to-reach pulley (often the alternator).
• Slowly return the tensioner to its resting position using the breaker bar.
• Remove the belt fully and compare it to the new belt for length and rib count.

Step 4: Route the new belt

• Route the new belt around the pulleys following the under-hood routing diagram (or your photo).
• Make sure the belt ribs sit perfectly in the grooved pulleys and the smooth side runs on smooth pulleys.
• Leave one easy pulley for last (the one you’ll slip the belt over when the tensioner is released).

Step 5: Re-apply tension and seat the belt

• Use the 14mm socket and breaker bar to rotate the tensioner again and create slack.
• Slip the belt onto the last pulley.
• Slowly release the tensioner back against the belt.
• Use the flashlight to check every pulley: the belt must be centered and fully seated.

Step 6: Reinstall any covers and lower the vehicle

• If you removed the splash shield, reinstall clips using the trim clip removal tool.
• If raised, lift slightly with the floor jack, remove jack stands, then lower the vehicle.

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✅ After Repair

• 🔍 Before starting, do one last visual check that the belt is seated in every pulley groove.
• 🔑 Start the engine and watch the belt for 20–30 seconds. It should run smoothly with no wobble.
• 👂 Listen for squeal or slapping noises. If you hear any, shut the engine off and re-check belt alignment.
• 🧪 After a short drive, re-check belt position again with a flashlight.

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💰 DIY vs Shop Cost

Shop Cost: $150–$300 (parts + labor)

DIY Cost: $25–$60 (parts only)

You Save: $125–$240 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.