🔧 Colorado - Serpentine Belt Replacement

The serpentine belt drives accessories like the alternator, power steering, and A/C. Replacing it restores proper accessory drive and helps prevent squealing, slipping, or a sudden no-charge/overheat situation if the belt breaks.

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

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⚠️ Safety & Precautions

• 🧤 Keep fingers/clothes clear of pulleys; never work near a running engine.
• 🔥 Let the engine cool; the radiator fan and front engine parts can be hot.
• 🔌 No battery disconnect is required, but keep the key out of the ignition to prevent accidental starting.
• 📸 Take a quick photo of belt routing before removal; routing mistakes are common.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8" drive breaker bar
• 3/8" drive ratchet
• 15mm socket
• 15mm box-end wrench
• Flashlight
• Mechanic gloves
• Safety glasses

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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.
• Open the hood and locate the belt routing diagram (usually on the radiator support/under-hood label). If it’s missing, take a clear photo of the current routing.
• Assumption: Belt is serviced without removing other components on your V6.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the belt tensioner

• Use a flashlight to find the belt tensioner (it’s the spring-loaded arm with a pulley).
• Look for either a 15mm hex on the tensioner arm or a square hole that accepts a 3/8" drive breaker bar.
• A “tensioner” is a spring-loaded part that keeps the belt tight automatically.

Step 2: Relieve belt tension

• Install a 15mm socket on a 3/8" drive breaker bar (or insert the breaker bar into the square hole if equipped).
• Slowly rotate the tensioner to release tension from the belt. Use steady pressure—spring force is strong.
• Tip: Move slowly; don’t let it snap back.

Step 3: Slip the belt off one upper pulley

• While holding the tensioner released with the breaker bar, use your free hand to slide the belt off an easy-to-reach upper pulley (often the alternator).
• Carefully return the tensioner back to its resting position (do not release it suddenly).

Step 4: Remove the belt completely

• Remove the belt from the remaining pulleys by hand.
• Use the flashlight to check each pulley groove for debris or rubber strands.

Step 5: Inspect pulleys and tensioner quickly

• Spin each smooth pulley by hand. It should spin freely and quietly.
• Wiggle each pulley. There should be no looseness.
• If you hear grinding or feel wobble, that pulley/tensioner may need replacement (that’s a separate repair).

Step 6: Route the new belt

• Route the new belt following the under-hood routing diagram (or your photo).
• Make sure the belt ribs sit fully inside the grooved pulleys (the grooves must match the ribs).
• Leave one easy-to-reach pulley for last so you can slip it on after releasing the tensioner.

Step 7: Apply tension and seat the belt

• Rotate the tensioner again using the 3/8" drive breaker bar and 15mm socket (or the breaker bar alone if using the square hole).
• Slide the belt onto the last pulley, then slowly let the tensioner return to apply tension.
• Use the flashlight to double-check the belt is centered on every pulley.

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✅ After Repair

• Start the engine and watch the belt for 20–30 seconds. It should run smoothly with no hopping or wandering.
• Listen for squealing or chirping. If you hear it, shut off the engine and re-check belt routing and pulley alignment.
• After a short test drive, do a quick re-check that the belt is still seated correctly.

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💰 DIY vs Shop Cost

Shop Cost: $120-$250 (parts + labor)

DIY Cost: $25-$60 (parts only)

You Save: $95-$190 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.

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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.