🔧 Serpentine Belt - Replacement

The serpentine belt on your F-150 drives key engine accessories like the alternator, water pump, and A/C compressor. If it’s cracked, noisy, or glazed, replacing it now helps prevent a roadside breakdown.

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

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⚠️ Safety & Precautions

• Engine must be off and completely cool before starting.
• Keep hands, hair, and clothing away from the belt path and pulley area.
• 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:

• 1/2-inch drive breaker bar
• 18mm socket
• Ratchet
• Flashlight
• Safety glasses
• Mechanic gloves

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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 and set the parking brake.
• Let the engine cool down fully.
• Open the hood and locate the belt routing label if your truck still has one.
• Work slowly so the belt stays routed correctly.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the belt routing

• Use a flashlight to look at the current belt path around the pulleys.
• If the routing label is present, note the path before removing anything.
• Taking a quick photo helps a lot.

Step 2: Release belt tension

• Use a 1/2-inch drive breaker bar with an 18mm socket on the belt tensioner.
• Rotate the tensioner to relieve belt tension.
• Hold it steady while you slip the belt off one pulley.

Step 3: Remove the old belt

• Slowly release the tensioner and pull the belt out of the engine bay.
• Inspect the old belt for cracks, missing ribs, or shiny glazed spots.

Step 4: Route the new belt

• Install the new serpentine belt around all pulleys except one easy-to-reach pulley.
• Use the belt routing path you noted earlier.
• Make sure the belt ribs sit fully in the grooved pulleys.
• Check each pulley groove by feel.

Step 5: Apply tension and finish installation

• Use the 1/2-inch drive breaker bar and 18mm socket again to rotate the tensioner.
• Slip the belt onto the last pulley while the tensioner is held back.
• Slowly release the tensioner.
• Check that the belt is centered on every pulley.

Step 6: Verify installation

• Visually inspect the full belt path one more time.
• Make sure there are no twists and no ribs hanging off a pulley edge.
• No torque spec applies to the belt itself.

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✅ After Repair

• Start the engine and let it idle.
• Listen for squealing, chirping, or slapping noises.
• Watch the belt for smooth tracking on all pulleys.
• If the belt jumps or squeals, shut the engine off and recheck routing.

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💰 DIY vs Shop Cost

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

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

You Save: $115-$220 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?

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.