🔧 Expedition - Serpentine Belt Replacement

The serpentine belt drives accessories like the alternator, water pump, and A/C compressor. If it’s cracked, noisy, glazed, or slipping, replacing it prevents breakdowns and charging/overheating problems.

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

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⚠️ Safety & Precautions

• 🧤 Work on a cold engine to avoid burns from hot parts.
• 🧯 Keep fingers clear of the belt path; the tensioner is spring-loaded and can snap back.
• 🧼 Don’t run the engine with hands/tools near the belt.
• 🔋 Battery disconnect is not required for this job, but keep the key off and away from the vehicle.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Flashlight
• Trim panel tool
• 1/2" drive breaker bar
• 1/2" drive serpentine belt tool (specialty)
• 3/8" drive ratchet
• 8mm socket
• 10mm socket
• Flat-blade screwdriver

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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 let the engine fully cool.
• Find the belt routing diagram (usually a sticker under the hood). If it’s missing, take a clear photo of the current routing before removing the belt.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Use a trim panel tool to gently pop the cover loose, or remove any fasteners with a 10mm socket (varies by cover style).
• Lift the cover off and set it aside. Pull straight up to avoid breaking grommets.

Step 2: Move the intake ducting for access (if needed)

• Loosen intake clamp(s) using an 8mm socket or flat-blade screwdriver.
• Unclip/loosen any attached tubes or retainers by hand, then move the duct out of the way.
• This creates space to reach the belt tensioner.

Step 3: Identify the belt tensioner and routing

• Locate the belt tensioner (a spring-loaded arm with a pulley).
• Most Ford tensioners have a square drive opening for a 1/2" drive breaker bar or 1/2" drive serpentine belt tool (specialty).
• A serpentine belt tool is a long, thin handle designed to reach tight spots safely.

Step 4: Release belt tension

• Insert a 1/2" drive breaker bar or 1/2" drive serpentine belt tool (specialty) into the tensioner’s square drive.
• Rotate the tensioner smoothly to relieve tension (it will feel strong because of the spring).
• While holding the tensioner back, slide the belt off one easy-to-reach pulley (usually an upper smooth/idler pulley).
• Slowly let the tensioner return to its rest position. Never let it snap back.

Step 5: Remove the old belt

• Pull the belt out of the remaining pulleys by hand.
• Use a flashlight to check pulleys for wobble, cracks, or rough bearings as you spin them by hand.

Step 6: Route the new belt

• Compare the new belt to the old one for length and rib count.
• Route the new belt following the under-hood diagram (or your photo).
• Make sure the ribbed side sits in ribbed pulleys and the smooth side sits on smooth pulleys.
• Fully seat the belt ribs into the grooves on every pulley you can see. One rib off = squeal and damage.

Step 7: Apply tension and finish installation

• Use the 1/2" drive breaker bar or 1/2" drive serpentine belt tool (specialty) to rotate the tensioner again.
• Slip the belt over the last pulley.
• Slowly release the tensioner and re-check belt alignment on all pulleys with a flashlight.

Step 8: Reinstall removed components

• Reinstall the intake ducting and tighten clamps using an 8mm socket or flat-blade screwdriver.
• Reinstall the engine cover (if removed) by pressing it onto the grommets or fastening it with a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds while you watch the belt track on the pulleys.
• Listen for squealing, chirping, or slapping noises (signs of misrouting or misalignment).
• Shut the engine off and do a final visual check with a flashlight to confirm the belt ribs are centered in the pulley grooves.

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💰 DIY vs Shop Cost

Shop Cost: $150-$300 (parts + labor)

DIY Cost: $35-$85 (parts only)

You Save: $115-$215 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.7-1.2 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.