🔧 Colorado - Serpentine Belt Replacement

Your Colorado’s serpentine belt drives key accessories like the alternator and A/C. If it’s cracked, glazed, noisy, or slipping, replacing it prevents charging and overheating problems.

Difficulty Level: Intermediate | Estimated Time: 0.5-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before working near pulleys.
• ⚠️ Keep fingers/clothes clear of the belt path and pulleys.
• ⚠️ The electric cooling fan can turn on unexpectedly; disconnecting the battery is recommended.
• ⚠️ Support tools firmly—belt tensioners are spring-loaded and can snap back.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3/8" drive ratchet
• 3/8" drive breaker bar
• 15mm combination wrench
• Serpentine belt tool (specialty)
• Flat trim tool
• Work light
• 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, shift to Park, and set the parking brake.
• Open the hood and locate the belt routing diagram (usually on the upper radiator support/underhood label). If it’s missing, take a clear photo of the current routing before removal.
• Disconnect the negative battery cable using a 10mm socket and move it aside so it can’t spring back.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Improve access to the belt area

• Remove the engine cover (if equipped) by pulling upward evenly with gloved hands; use a flat trim tool only if needed to gently help release grommets.
• If the air intake duct blocks access, loosen its clamps with a 10mm socket and 1/4" drive ratchet, then reposition/remove the duct.
• Take a photo of belt routing now.

Step 2: Locate the automatic belt tensioner

• Use a work light to find the spring-loaded tensioner pulley (this pulley is mounted on a spring arm that keeps the belt tight).
• Look for either a hex “bolt head” to turn, or a square hole for a ratchet/breaker bar.

Step 3: Release belt tension

• If your tensioner has a hex head: put a 15mm combination wrench on it.
• If your tensioner has a square drive hole: insert a 3/8" drive breaker bar (or 3/8" drive ratchet) into the square hole.
• Rotate the tensioner smoothly to relieve tension, then slide the belt off the easiest-to-reach top pulley.
• Move the tensioner slowly—don’t let it snap back.

Step 4: Remove the old belt

• With the belt loose, pull it out of the remaining pulleys by hand.
• Spin each pulley by hand (idler/tensioner/alternator) and feel for roughness or wobble. If a pulley feels gritty, that part likely needs replacement before the new belt goes on.

Step 5: Route the new belt

• Route the new belt around the pulleys exactly like the underhood diagram (leave the easiest top pulley for last).
• Make sure the belt ribs sit fully inside the ribbed pulleys and the belt sits centered on smooth pulleys.
• One rib off can shred a new belt fast.

Step 6: Re-apply tension and verify alignment

• Rotate the tensioner again using the 15mm combination wrench or 3/8" drive breaker bar.
• Slide the belt onto the last pulley, then release the tensioner slowly.
• Do a final visual check with the work light: the belt should be fully seated in every pulley groove.

Step 7: Reinstall removed items

• Reinstall the intake duct and tighten clamps using a 10mm socket and 1/4" drive ratchet.
• Reinstall the engine cover by pressing straight down until it seats.
• Reconnect the negative battery cable using a 10mm socket and 1/4" drive ratchet. Torque to 5 Nm (44 in-lbs).

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✅ After Repair

• Start the engine and watch the belt for 30–60 seconds. It should run smoothly with no wandering or squeal.
• Turn the A/C on and off and listen for chirping. If noise happens, shut off and re-check belt seating and routing.
• After a short test drive, re-check alignment again with the engine off.

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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 0.5-1.0 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.