🔧 Grand Cherokee - Serpentine Belt Replacement

The serpentine belt drives accessories like the alternator and A/C compressor. If it’s cracked, glazed, noisy, or slipping, replacing it restores proper accessory operation and helps prevent a roadside breakdown.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; hot pulleys can burn you.
• ⚠️ Keep fingers, hair, and clothing away from belt paths and pulleys.
• ⚠️ Do not start the engine with hands/tools near the belt.
• ⚠️ Battery disconnect is not required for this job, but keep the key fob away so the engine can’t be started accidentally.

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🔧 Required Tools

You'll need the following tools for this repair:

• 15mm socket
• 3/8" drive ratchet
• 3/8" drive long handle breaker bar
• 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 find the belt routing diagram (usually a sticker on the radiator support/under-hood area).
• If there’s no sticker, use your phone to take a clear photo of the current belt routing before removing it.
• Tip: Draw a quick sketch of the routing.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Grip the cover with both hands and pull upward to pop it off the rubber grommets.
• Set it aside so you have clear access and better lighting.

Step 2: Inspect the pulleys before removing the belt

• Use a flashlight to look at each pulley for wobble, heavy rust, or damaged ribs.
• Spin any easy-to-reach smooth pulleys by hand (engine OFF). They should spin smoothly and quietly.
• If a pulley feels rough or noisy, the belt may not be the only problem.

Step 3: Release belt tension

• Put a 15mm socket on the belt tensioner arm’s bolt head, then attach your 3/8" drive ratchet or 3/8" drive long handle breaker bar.
• Rotate the tensioner to relieve tension (it will feel strong—this is normal).
• Serpentine belt tool can make this easier in tight spaces (a thin long handle designed for belt tensioners).

Step 4: Slip the belt off one top pulley

• While holding the tensioner rotated, slide the belt off an easy-to-reach top pulley (commonly the alternator).
• Slowly let the tensioner return to its resting position (don’t let it snap back).

Step 5: Remove the old belt

• Pull the belt out from the remaining pulleys and remove it from the engine bay.
• Compare the old belt to the new belt (length and rib count should match).

Step 6: Route the new belt

• Using the under-hood routing diagram (or your photo), route the new belt around the pulleys.
• Make sure the ribbed side sits in the ribbed pulleys, and the smooth side rides on smooth pulleys.
• Leave the easiest top pulley for last so you can slip it on after releasing tension.
• Tip: A single rib off can shred the belt.

Step 7: Apply tension and finish installation

• Use the 15mm socket with the 3/8" drive ratchet or breaker bar to rotate the tensioner again.
• Slide the belt onto the last pulley, then slowly release the tensioner.
• Double-check the belt is centered on every pulley.

Step 8: Reinstall the engine cover

• Align the engine cover with the mounting grommets and press down firmly until it snaps into place.

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✅ After Repair

• Start the engine and watch the belt for 20–30 seconds from a safe distance.
• Make sure the belt runs straight and doesn’t walk off any pulley.
• Listen for squealing or chirping; if you hear it, shut off and re-check routing and seating in the ribs.
• Recheck belt alignment once more after a short 5–10 minute drive.

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💰 DIY vs Shop Cost

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

DIY Cost: $30-$70 (parts only)

You Save: $120-$230 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.