🔧 Yukon - Serpentine Belt Replacement

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

Difficulty Level: Intermediate | Estimated Time: 0.5-1.0 hours

---

⚠️ Safety & Precautions

• 🛑 Work on a cool engine; keep hands away from the fan/shroud area.
• 🛑 Keep fingers clear of the belt and pulleys while releasing the tensioner.
• 🛑 Remove the key/fob from the vehicle so it can’t crank unexpectedly.
• 🛑 Battery disconnect is not required, but avoid shorting tools on the alternator.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 15mm socket
• 3/8" drive ratchet
• 3/8" drive breaker bar
• 3" socket extension (3/8")
• Flashlight
• Nitrile gloves
• Safety glasses

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1

---

📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Let the engine cool fully.
• Find the belt routing diagram sticker under the hood (usually on the fan shroud/upper radiator support). Take a photo for reference.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Grip the cover at the corners and pull straight upward to release the rubber grommets.
• Set it aside where it won’t get stepped on.

Step 2: Inspect and confirm belt routing

• Use a flashlight to locate every pulley the belt runs on.
• Compare what you see to the under-hood routing diagram. If the sticker is missing, sketch the route before removing the belt.

Step 3: Release belt tension (use the tensioner)

• Locate the belt tensioner (spring-loaded arm with a smooth pulley).
• Install a 15mm socket on a 3/8" drive breaker bar (use a 3" socket extension (3/8") if it helps reach).
• Turn the tensioner clockwise to relieve belt tension. Move it slowly and steadily.

Step 4: Remove the old belt

• While holding the tensioner rotated with the 3/8" drive breaker bar, slip the belt off the easiest-to-reach top pulley (commonly the alternator).
• Slowly release the tensioner back to its resting position.
• Remove the belt from the remaining pulleys and take it out of the engine bay.

Step 5: Quick pulley check (important)

• Spin each pulley by hand and feel for roughness or wobble.
• Look for oil/coolant on pulleys; contamination can ruin the new belt quickly.

Step 6: Route the new belt

• Route the new belt around all pulleys per the under-hood diagram, leaving the most accessible top pulley for last.
• Make sure the ribbed side seats into ribbed pulleys, and the smooth side rides on smooth pulleys.
• Use a flashlight to confirm the belt ribs are fully seated in every groove. One rib off can shred the belt.

Step 7: Apply tension and install the final pulley

• Use the 15mm socket on the 3/8" drive breaker bar to rotate the tensioner clockwise again.
• Slip the belt onto the last pulley.
• Slowly release the tensioner.

Step 8: Final alignment check

• Use a flashlight and look at each pulley from above to confirm the belt is centered and fully seated.
• Reinstall the engine cover by aligning the grommets and pressing straight down.

---

✅ After Repair

• Start the engine and watch the belt for 30-60 seconds; it should run smoothly with no wandering.
• Listen for chirping/squealing. If you hear noise, shut it off and re-check belt seating on every pulley.
• Take a short test drive, then recheck visually for proper tracking.

---

💰 DIY vs Shop Cost

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

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

You Save: $95-$285 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.

---

🎯 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.