🔧 Colorado - Serpentine Belt Replacement

Replacing the serpentine belt on your Colorado means removing the old accessory drive belt and installing a new one in the correct routing path. The belt drives key accessories like the alternator, water pump, and A/C compressor, so replace it if it is cracked, glazed, squealing, or stretched.

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

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely before working near the belt, pulleys, or fan area.
• ⚠️ Keep fingers, clothing, and tools away from the belt path while the engine is running.
• ⚠️ Do not start the engine until the new belt is fully seated in every pulley groove.
• ⚠️ Battery disconnect is not normally required for this repair, but keep the key out of the ignition while working.

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🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive serpentine belt tool
• 3/8-inch drive long-handle ratchet
• 15mm socket
• Flathead screwdriver
• 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 your Colorado on level ground, shift to Park, and set the parking brake.
• Turn the engine off and remove the key from the vehicle.
• Open the hood and support it securely.
• Use a flashlight to find the belt routing diagram decal under the hood. This decal shows the correct path for the belt.
• If the decal is missing, take a clear photo of the old belt routing before removal.
• A serpentine belt tool is a long, thin handle used to rotate the spring-loaded belt tensioner and create slack in the belt.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the Belt and Tensioner

• Use a flashlight to inspect the front of the engine where the serpentine belt wraps around the pulleys.
• Find the belt tensioner. The tensioner is a spring-loaded pulley arm that keeps the belt tight automatically.
• On your Colorado, the tensioner has a square drive opening for a 3/8-inch drive serpentine belt tool or 3/8-inch drive long-handle ratchet.
• Take a photo first.

Step 2: Check the Belt Routing

• Use a flashlight to compare the belt path to the under-hood routing decal.
• If the routing decal is hard to see, use your phone photo as your reference.
• Make sure you understand which pulleys have grooves and which pulleys are smooth. The grooved side of the belt rides on grooved pulleys.

Step 3: Release Belt Tension

• Insert the 3/8-inch drive serpentine belt tool or 3/8-inch drive long-handle ratchet into the square opening on the belt tensioner.
• Slowly rotate the tensioner clockwise to relieve tension from the belt.
• Keep steady pressure on the tool. The tensioner spring is strong and can snap back quickly.
• No bolt is removed here, so there is no torque spec for this step.

Step 4: Remove the Old Belt

• While holding the tensioner released with the 3/8-inch drive serpentine belt tool, slide the belt off the easiest smooth pulley first.
• Slowly let the tensioner return to its resting position.
• Use your hands with mechanic gloves to remove the belt from the remaining pulleys.
• If the belt is stuck on a pulley edge, use a flathead screwdriver carefully to guide it off. Do not pry against plastic parts.

Step 5: Inspect the Pulleys

• Use a flashlight to inspect each pulley before installing the new belt.
• Spin the smooth idler pulleys by hand. They should turn smoothly without grinding, wobbling, or noise.
• Check the tensioner pulley for looseness or roughness.
• If any pulley is noisy or loose, replace it before installing the new belt.
• A bad pulley ruins new belts.

Step 6: Route the New Belt

• Use your hands to route the new serpentine belt around the lower and larger pulleys first.
• Follow the belt routing decal exactly.
• Leave the easiest upper smooth pulley for last.
• Make sure the ribbed side of the belt sits fully in the grooved pulleys.
• Make sure the smooth back side of the belt rides on smooth pulleys only.

Step 7: Release the Tensioner Again

• Insert the 3/8-inch drive serpentine belt tool or 3/8-inch drive long-handle ratchet into the tensioner again.
• Rotate the tensioner clockwise to create slack.
• Slide the new belt over the final pulley by hand.
• Slowly release the tensioner until it tightens the belt.
• No mounting bolts are removed, so there is no torque spec for this step.

Step 8: Verify Belt Alignment

• Use a flashlight to check every pulley carefully.
• Confirm the belt ribs are fully seated in every grooved pulley.
• Confirm the belt is centered on every smooth pulley.
• If the belt is one rib off, use the 3/8-inch drive serpentine belt tool to release tension and reposition it.
• Do not skip this check.

Step 9: Start and Inspect

• Remove all tools from the engine bay.
• Start the engine and let it idle for 30 seconds.
• Use a flashlight to watch the belt from a safe distance.
• Look for wobbling, walking off a pulley, chirping, or squealing.
• Turn the engine off and recheck belt seating after the first short run.

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✅ After Repair

• Start your Colorado and listen for belt squeal or chirping.
• Turn the A/C on and confirm the belt continues running smoothly.
• Check that the battery warning light is off, since the belt drives the alternator.
• After a short drive, turn the engine off and inspect the belt again with a flashlight.
• If the belt tracks off-center, stop driving and recheck routing and pulley condition.

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💰 DIY vs Shop Cost

Shop Cost: $140-$260 parts + labor

DIY Cost: $25-$60 parts only

You Save: $115-$200 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?

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