🔧 Impala - Serpentine Belt Replacement

The serpentine belt (also called the accessory drive belt) runs your alternator, power steering pump, and A/C. Replacing it is mostly about safely reaching the belt and releasing the spring-loaded belt tensioner so the belt can come off and the new one can go on.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; the belt area can burn you.
• ⚠️ Keep fingers and tools away from pulleys; the tensioner can snap back hard.
• ⚠️ Support the car with jack stands; never rely on a floor jack.
• ⚠️ Do not start the engine with hands/tools near the belt.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• Breaker bar 3/8" drive
• Ratchet 3/8" drive
• Serpentine belt tool (specialty)
• Socket set (8mm, 10mm, 13mm, 15mm)
• Lug nut socket 19mm
• Torque wrench 20-150 ft-lbs
• Trim clip remover
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt (6-rib accessory drive belt) - Qty: 1
• Fender liner / splash shield clips - Qty: 1 set (as needed)

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Open the hood and look for the belt routing diagram sticker (often on the radiator support). If it’s missing, take a clear photo of the current belt routing before removal.
• Know this term: the belt tensioner is a spring-loaded arm that keeps the belt tight; you rotate it to release belt tension.
• Battery disconnect is not required for this job, but keep the key out of the ignition so no one can start it.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise the front-right corner safely

• Use wheel chocks at the rear wheels.
• Use a floor jack to lift the front-right jacking point.
• Set the car onto jack stands and give the car a gentle push to confirm it’s stable.

Step 2: Remove the front-right wheel

• Use a 19mm lug nut socket with a breaker bar 3/8" drive to loosen lug nuts, then remove them with a ratchet 3/8" drive.
• Remove the wheel and slide it under the rocker panel as an extra safety backup.
• During reassembly: Torque to 135 Nm (100 ft-lbs).

Step 3: Open access through the splash shield (wheel-well liner)

• Use a trim clip remover to pop out plastic push-clips without breaking them.
• Use 8mm socket or 10mm socket (varies by fastener) with a ratchet 3/8" drive to remove screws along the front/lower edge.
• Pull the liner back enough to clearly see the belt and pulleys; use a flashlight.
• Tip: Don’t fully remove the liner.

Step 4: Relieve belt tension

• Put on safety glasses and mechanic gloves.
• Locate the belt tensioner pulley. On your Impala, you typically rotate the tensioner using either:
• Use a serpentine belt tool (specialty) on the tensioner’s 15mm hex, or insert a breaker bar 3/8" drive into the square drive on the tensioner (if equipped).
• Rotate the tensioner slowly to release tension, then slide the belt off the nearest smooth pulley.
• Carefully let the tensioner return to its resting position—do not let it snap back.
• Know this tool: a serpentine belt tool is a long, thin handle made to reach the tensioner in tight spaces.

Step 5: Remove the old belt and inspect pulleys

• Remove the belt from the remaining pulleys by hand from the wheel well.
• Spin the idler and tensioner pulleys by hand. They should spin smoothly and quietly with no wobble.
• If you hear grinding, feel roughness, or see wobble, plan to replace that pulley/tensioner before installing the new belt.

Step 6: Route the new belt correctly

• Match the new belt length/rib count to the old one before installing.
• Route the belt following the under-hood diagram. Make sure the ribbed side sits in the grooves of ribbed pulleys.
• Leave the easiest-to-reach pulley for last (often a smooth idler pulley).
• Tip: One rib off will shred the belt.

Step 7: Apply tension and seat the belt

• Use the serpentine belt tool (specialty) or breaker bar 3/8" drive to rotate the tensioner again.
• Slip the belt onto the last pulley, then slowly release the tensioner.
• Visually check every pulley: the belt must be centered and fully seated in each groove.

Step 8: Reinstall splash shield and wheel

• Reposition the liner and reinstall screws with an 8mm socket or 10mm socket using a ratchet 3/8" drive.
• Reinstall clips using the trim clip remover to align them, then push to lock.
• Reinstall the wheel using a 19mm lug nut socket and ratchet 3/8" drive.
• Lower the car with the floor jack, then use a torque wrench 20-150 ft-lbs: Torque to 135 Nm (100 ft-lbs) in a star pattern.

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✅ After Repair

• Start the engine and watch the belt for 15–30 seconds; it should run smooth with no wobble.
• Listen for chirping/squealing. If you hear it, shut the engine off and re-check belt alignment on every pulley.
• Take a short test drive, then re-check the belt seating through the wheel well.

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💰 DIY vs Shop Cost

Shop Cost: $150-$280 (parts + labor)

DIY Cost: $25-$55 (parts only)

You Save: $125-$225 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?

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