🔧 Grand Cherokee - Serpentine Belt Replacement

The serpentine belt drives key accessories like the alternator and A/C. If it’s cracked, noisy, glazed, or you’ve had charging/overheating symptoms, replacing it prevents a breakdown.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; the fan, pulleys, and belt can grab fingers.
• ⚠️ Keep hands/tools clear of the fan and pulleys at all times.
• ⚠️ Do not start the engine with tools in the belt area.
• Disconnecting the battery is not required, but remove the key and keep it away from the vehicle.

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🔧 Required Tools

You'll need the following tools for this repair:

• 17mm socket
• 3/8" drive ratchet
• 3"-6" socket extension
• Serpentine belt tool (specialty)
• 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 use a flashlight to find the belt routing diagram (often on the radiator support/underside of hood).
• If there’s no diagram, 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.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the belt tensioner

• Use a flashlight to locate the spring-loaded tensioner pulley on the front of the engine.
• Look for a hex “boss” on the tensioner arm where a socket fits (commonly used to rotate the tensioner).

Step 2: Relieve belt tension

• Install a 17mm socket on a 3/8" drive ratchet (use a 3"-6" socket extension if needed for reach).
• Rotate the tensioner smoothly to release tension (it will feel springy). Keep steady pressure—don’t let it snap back.
• If access is tight, use a serpentine belt tool (specialty) (this is a long, slim handle made for turning the tensioner in tight spaces).

Step 3: Slip the belt off one top pulley

• While holding the tensioner rotated, use your free hand to slide the belt off an easy-to-reach top pulley (often the alternator pulley).
• Slowly let the tensioner return to its resting position using the 3/8" drive ratchet.

Step 4: Remove the old belt

• Pull the belt out of the remaining pulleys by hand.
• Use the flashlight to inspect each pulley for wobble, cracks, or rough spinning.
• If a pulley feels rough or noisy when spun by hand, stop—an idler/tensioner pulley may need replacement before installing the new belt.

Step 5: Route the new belt

• Route the new belt around the pulleys following the under-hood diagram (or your photo).
• Make sure the belt ribs sit fully in the ribbed pulleys, and the smooth side rides on smooth pulleys.
• Leave the easiest top pulley for last (so you have slack to slip it on).

Step 6: Apply tension and install the last section

• Use the 17mm socket with the 3/8" drive ratchet to rotate the tensioner again.
• Slip the belt onto the final pulley.
• Slowly release the tensioner back into place. Double-check every pulley before releasing fully.

Step 7: Final alignment check

• Use a flashlight to confirm the belt is centered on every pulley and fully seated in the grooves.
• If the belt is off by one rib anywhere, relieve tension and re-seat it now.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds while you watch the belt track (keep hands clear).
• Listen for chirping/squealing; if you hear it, shut off and re-check alignment.
• Recheck belt seating one more time after a short test drive.

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💰 DIY vs Shop Cost

Shop Cost: $150-$300 (parts + labor)

DIY Cost: $35-$90 (parts only)

You Save: $115-$210 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.