🔧 Serpentine Belt - Replacement

Your belt drives the alternator, water pump, A/C compressor, and other accessories. On your F-150, replacement is straightforward, but the belt tension is strong, so keeping the tool steady matters more than force.

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

---

⚠️ Safety & Precautions

• Let the engine cool fully before starting.
• Keep fingers, clothing, and tools clear of the belt path.
• 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.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 1/2-inch breaker bar
• 3/8-inch drive ratchet
• Serpentine belt tool (specialty)
• Flashlight
• Safety glasses
• Mechanic gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1

---

📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and find the belt routing diagram on the radiator support or underhood label.
• If there is no diagram, take a clear photo of the belt path before removing it.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the belt tensioner

• Open the hood and look at the front of the engine.
• Find the spring-loaded tensioner pulley. It has a smooth pulley on an arm.
• Use a flashlight if the belt path is hard to see.

Step 2: Make a routing reference

• Use your phone to take a photo of the belt routing.
• If there is a factory routing diagram, compare it to the belt path.
• Routing mistakes are the most common problem.

Step 3: Release belt tension

• Place a 1/2-inch breaker bar or serpentine belt tool (specialty) on the tensioner.
• Rotate the tensioner to relieve belt tension.
• Hold the tensioner steady while slipping the belt off one of the easiest-access pulleys.

Step 4: Remove the old belt

• Slowly release the tensioner.
• Remove the belt from all pulleys by hand.
• Inspect the old belt for cracks, missing ribs, glazing, or fraying.

Step 5: Compare the new belt

• Lay the new belt next to the old one.
• Make sure the length and rib count match.
• Confirm the new belt is the same style before installing it.

Step 6: Install the new belt

• Route the belt around all pulleys except one easy-to-reach pulley.
• Use the routing diagram or your photo to verify each pulley is correct.
• Keep the ribbed side of the belt seated in the grooved pulleys.

Step 7: Tension the belt

• Use the 1/2-inch breaker bar or serpentine belt tool (specialty) to rotate the tensioner again.
• Slip the belt onto the last pulley.
• Slowly release the tensioner and make sure the belt is fully seated on every pulley.

Step 8: Inspect the installation

• Check each pulley by sight to confirm the belt is centered.
• Spin the alternator and idler pulley by hand only if easily reachable and safe to do so.
• Make sure no belt edge is hanging off a pulley.

---

✅ After Repair

• Start the engine and watch the belt for 30-60 seconds.
• Listen for squealing, chirping, or rubbing.
• Turn on the A/C and headlights to confirm stable operation.
• If the belt tracks off-center, shut the engine off and recheck routing.

---

💰 DIY vs Shop Cost

Shop Cost: $160-$280 (parts + labor)

DIY Cost: $35-$70 (parts only)

You Save: $125-$210 by doing it yourself!

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

---

🎯 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.