🔧 Serpentine Belt - Replacement

The serpentine belt drives the alternator, water pump, and other accessories. On your Explorer, the belt is removed by relieving the automatic tensioner, then routed off the pulleys and installed with the correct path.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

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⚠️ Safety & Precautions

• Let the engine cool completely before starting. Hot pulleys and the engine bay can cause burns.
• Keep hands, hair, and clothing clear of the belt path. The tensioner can snap back suddenly.
• Do not start the engine with the belt removed.
• No battery disconnect is required for this repair.
• Take a photo of the belt routing first.

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🔧 Required Tools

You'll need the following tools for this repair:

• Serpentine belt tool (specialty)
• 15mm wrench
• Ratchet
• 3/8-inch drive breaker bar
• Flashlight
• Safety glasses
• Mechanic gloves
• Wheel chocks

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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.
• Set the parking brake.
• Turn the ignition off and remove the key or fob from the vehicle.
• Let the engine cool fully.
• Verify the belt routing before removal.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the hood and locate the belt path

• Open the hood and find the serpentine belt at the front of the engine.
• Use a flashlight to trace the belt around the pulleys.
• If a belt routing diagram is present, study it before removing anything.

Step 2: Release belt tension

• Use a serpentine belt tool (specialty) or 3/8-inch drive breaker bar on the tensioner.
• Rotate the tensioner to relieve belt tension.
• Move slowly to avoid slipping.

Step 3: Remove the old belt

• While holding tension off the belt, slip the belt off one easy-access pulley using your hand.
• Slowly release the tensioner.
• Remove the belt from the remaining pulleys.

Step 4: Compare the new belt

• Lay the new serpentine belt next to the old one.
• Make sure the length and rib count match.
• Check that the new belt is not twisted or damaged.

Step 5: Install the new belt

• Route the belt around all pulleys except one easy-access pulley.
• Use the serpentine belt tool (specialty) or 3/8-inch drive breaker bar to rotate the tensioner again.
• Slip the belt over the last pulley by hand.
• Make sure the belt ribs sit fully in every grooved pulley.

Step 6: Inspect belt alignment

• Check every pulley from above for proper seating.
• Look for twists, slack, or a belt edge hanging off a pulley.
• If needed, remove and reinstall the belt before starting the engine.

Step 7: Start and verify

• Start the engine and watch the belt for a few seconds.
• Listen for squealing, chirping, or wobble.
• If the belt tracks straight and quiet, the job is done.

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✅ After Repair

• Run the engine for 1-2 minutes and recheck belt tracking.
• Turn on the A/C, headlights, and rear defroster to confirm smooth operation under load.
• If you hear noise, shut the engine off and recheck routing and pulley alignment.

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💰 DIY vs Shop Cost

Shop Cost: $180-$320 (parts + labor)

DIY Cost: $35-$90 (parts only)

You Save: $145-$230 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1 hour.

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🎯 Ready to get started?

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