🔧 Grand Cherokee - Serpentine Belt Replacement

The serpentine belt is the single belt that drives accessories like the alternator and A/C. On your Grand Cherokee, you’ll release the spring-loaded belt tensioner, slip the old belt off, then route and install the new belt correctly.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; hot pulleys and coolant parts can burn you.
• ⚠️ Keep fingers/tools clear of the belt and pulleys while releasing the tensioner (it’s spring-loaded and snaps back).
• ⚠️ Wear eye protection; debris can fall while working at the front of the engine.
• Battery disconnect is not required for belt replacement, but keep tools away from the alternator electrical connections.

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🔧 Required Tools

You'll need the following tools for this repair:

• 15mm socket
• 3/8" drive ratchet
• 3/8" drive breaker bar (18"-24")
• 10mm socket
• 1/4" drive ratchet
• Flathead screwdriver
• Trim clip removal tool
• 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, shift to Park, and set the parking brake.
• Open the hood and take a clear photo of the belt routing (or use the routing diagram sticker under the hood if equipped).
• Routing matters—one pulley wrong can shred the belt.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Grip the cover firmly and pull straight upward to release the rubber grommets.
• Set it aside where it won’t get stepped on.

Step 2: Make working room at the front of the engine

• Use a flathead screwdriver and trim clip removal tool to release any intake duct clips in your way.
• If the upper air inlet/resonator is blocking access, remove its fasteners using a 10mm socket and 1/4" drive ratchet, then lift it out.
• Reinstall these 10mm fasteners later: Torque to 9 Nm (80 in-lbs).
• Take a quick photo before removing ducts.

Step 3: Locate the belt tensioner

• Use a flashlight to find the belt tensioner at the front of the engine.
• The tensioner is the spring-loaded arm with a pulley; the 15mm hex is used to rotate it. (A “tensioner” keeps the belt tight automatically.)

Step 4: Relieve belt tension

• Install a 15mm socket on the tensioner hex and use a 3/8" breaker bar for leverage.
• Rotate the tensioner smoothly to relieve belt tension (you’ll feel the spring load).
• While holding the tensioner, slide the belt off the easiest-to-reach top pulley.
• Slowly let the tensioner return to its resting position—do not let it snap back.

Step 5: Remove the old belt

• Pull the belt out from around the remaining pulleys by hand.
• Spin each pulley by hand and listen/feel for grinding or wobble (a bad pulley can destroy a new belt quickly).

Step 6: Route the new belt

• Compare the new belt to the old one for matching length and rib count.
• Route the belt according to the under-hood diagram (or your photo), keeping the ribs seated in the grooved pulleys.
• Leave the easiest top pulley for last (so you can slip it on after releasing tension).

Step 7: Apply tension and install the belt

• Use the 15mm socket and 3/8" breaker bar to rotate the tensioner again.
• Slip the belt fully onto the last pulley, then slowly release the tensioner.
• Double-check belt alignment on every pulley with a flashlight—the belt should not hang off any pulley edge.
• Misalignment is the #1 cause of squeal.

Step 8: Reinstall removed intake parts and engine cover

• Reinstall any intake ducting you removed using the 10mm socket and 1/4" drive ratchet.
• Torque to 9 Nm (80 in-lbs) for the 10mm intake/resonator fasteners.
• Push the engine cover back onto the grommets until it seats.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds while you watch the belt track smoothly.
• Listen for chirping/squealing. If you hear it, shut the engine off and re-check pulley alignment.
• Take a short test drive, then re-check belt position one more time.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $30-$80 (parts only)

You Save: $100-$270 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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