🔧 Grand Cherokee - Serpentine Belt Replacement

The serpentine belt on your Grand Cherokee drives the alternator, power steering, A/C and other accessories. You’ll remove tension from the belt, route a new one correctly over all pulleys, and verify proper operation.

Difficulty Level: Beginner-Intermediate | Estimated Time: 1–1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Always work with the engine off and completely cooled down to avoid burns.
• ⚠️ Remove the key and keep it away from the vehicle so no one can start the engine while you’re working.
• ⚠️ Keep fingers, clothing, and tools away from pulleys and fans; never rotate the engine by “bumping” the starter.
• ⚠️ If you raise the front of the Grand Cherokee, always use a floor jack and jack stands rated for SUV weight.
• ⚠️ Disconnect the negative battery cable if you feel more comfortable around moving fans, as the electric fan can run unexpectedly.

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🔧 Required Tools

You'll need the following tools for this repair:

• 🛠️ Serpentine belt tool set (specialty)
• 🛠️ 3/8" drive ratchet
• 🛠️ 1/2" drive ratchet
• 🛠️ 15mm shallow socket
• 🛠️ 13mm socket
• 🛠️ 10mm socket
• 🛠️ 8mm socket
• 🛠️ 3/8" drive extension (6")
• 🛠️ Flat-blade screwdriver (medium)
• 🛠️ Trim clip removal tool (specialty)
• 🛠️ Floor jack (rated 3-ton minimum)
• 🛠️ Jack stands (rated 3-ton minimum)
• 🛠️ Wheel chocks
• 🛠️ Work light or flashlight
• 🛠️ Mechanic’s gloves
• 🛠️ Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 🔩 Serpentine drive belt (5.7L) - Qty: 1
• 🔩 Belt tensioner assembly - Qty: 1 (optional but recommended if high mileage)
• 🔩 Idler pulley - Qty: 1 (optional, replace if noisy or worn)
• 🔩 Dielectric grease - Qty: 1 small tube (optional for battery connection)
• 🔩 Plastic push clips for lower splash shield - Qty: 4–6 (optional, in case old clips break)

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📋 Before You Begin

• Park the Grand Cherokee on level ground, shift to P, and set the parking brake.
• Place wheel chocks behind the rear wheels.
• Open the hood and use the prop rod or hood supports as designed.
• If you prefer extra safety around the electric cooling fan, disconnect the battery:
  • Loosen the negative terminal nut with a 10mm socket and remove the cable from the battery post.
• Turn on your work light so you can clearly see the front of the engine and the belt path.
• Locate the belt routing diagram sticker under the hood; if missing, take a clear photo of the existing belt routing from a few angles.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and secure the front (if needed)

• If access from the top is tight, you may need to work from below as well.
• Position the floor jack (3-ton) under the front crossmember and lift the front of the Grand Cherokee.
• Place jack stands under the factory jacking points and gently lower the vehicle onto the stands.
• Never work under a vehicle supported only by a jack.

Step 2: Remove the lower splash shield (if equipped)

• Use the 8mm socket and 3/8" ratchet to remove the small screws holding the plastic splash shield under the front of the engine.
• Use the trim clip removal tool or flat-blade screwdriver to pop out any plastic push clips.
• Lower the shield and set it aside where you won’t step on it.

Step 3: Locate the belt tensioner on the 5.7L

• From the front of the engine, look for the spring-loaded tensioner; it’s a small arm with a pulley on the end, usually near the passenger side of the front of the engine.
• The tensioner pulley has a 15mm bolt head or a square boss where your serpentine belt tool or ratchet fits.
• Wipe dirt off the area so you can see clearly.

Step 4: Note the belt routing

• If the factory diagram sticker is present, compare it to the actual routing.
• If no sticker, use your phone to take multiple photos of the belt path over:
  • Crankshaft pulley (bottom large pulley)
  • Alternator
  • Power steering pump
  • A/C compressor
  • Idler pulley
  • Tensioner pulley
• Photos save huge frustration later.

Step 5: Release tension on the serpentine belt

• Attach the 15mm socket to your serpentine belt tool or to a long 1/2" ratchet.
• Place the socket on the tensioner pulley bolt.
• Rotate the tensioner clockwise (toward the passenger side) to relieve belt tension. It will feel springy.
• While holding the tensioner in the released position, use your free hand to slide the belt off one smooth pulley (usually the idler or alternator).
• Slowly let the tensioner return to its resting position.
• Move slowly to avoid snapping back the tensioner.

Step 6: Remove the old belt

• From the top and bottom, carefully pull the belt out from around the fan shroud and all pulleys.
• Note any areas where the belt was twisted or routed tightly; this helps when installing the new one.
• Lay the old belt flat on the ground.

Step 7: Compare new belt to old belt

• Place the new belt next to the old belt on the ground.
• The length should be nearly identical (a few millimeters difference is okay).
• Count the ribs (the grooves) on both belts; they should match.
• Do not install a belt that’s clearly shorter or longer.

Step 8: Inspect pulleys and tensioner

• Spin each accessible pulley (idler, tensioner, alternator, power steering) by hand.
• If a pulley feels rough, makes noise, or has side-to-side play, plan to replace that pulley or the tensioner assembly.
• Check the tensioner arm for smooth spring movement by gently rotating it with the 15mm socket again.

Step 9: Route the new belt (initial placement)

• Refer to the routing diagram sticker or your photos.
• From the bottom, wrap the belt around the crankshaft pulley first, making sure all ribs sit in the grooves.
• Route the belt up and around the lower accessories (A/C compressor and power steering) as shown in the diagram, leaving the easiest upper pulley (often the idler or alternator) for last.
• Make sure ribs stay aligned as you route.

Step 10: Finish routing and apply tension

• From the top, route the belt over the remaining pulleys according to the diagram, again leaving one smooth pulley for last.
• Double-check that:
  • The belt sits centered on each ribbed pulley.
  • The back (smooth side) of the belt only runs over smooth pulleys.
• Place the 15mm socket and serpentine belt tool on the tensioner bolt again.
• Rotate the tensioner clockwise to relieve tension.
• Slip the belt fully onto the last smooth pulley (often the idler) while holding the tensioner.
• Release the tensioner slowly so it takes up the slack and tensions the belt.

Step 11: Final belt alignment check

• From the top, look at each pulley and confirm the belt is:
  • Centered on the grooves
  • Not hanging off any edge
  • Not twisted
• From underneath, re-check the crankshaft pulley and A/C pulley for proper seating.
• Fix any misalignment before starting the engine.

Step 12: Reinstall the lower splash shield

• Lift the splash shield back into place under the engine.
• Install the screws with the 8mm socket and 3/8" ratchet. Tighten them snugly: Torque to 9 Nm (80 in-lbs).
• Reinstall any plastic push clips using your fingers or the trim clip removal tool to press them fully in.

Step 13: Lower the vehicle and reconnect battery

• Use the floor jack to lift the front slightly, remove the jack stands, then lower the Grand Cherokee to the ground.
• If you disconnected the battery, reinstall the negative battery cable and tighten the nut with a 10mm socket to snug: Torque to 6 Nm (53 in-lbs).

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✅ After Repair

• Remove all tools from the engine bay and under the vehicle.
• Start the engine and let it idle while you watch the belt from the side (keep hands and clothing clear).
• Check that the belt runs smoothly, with no wobble, no squealing, and no visible misalignment.
• Turn on the A/C, turn the steering wheel gently, and watch that the belt still runs smoothly under load.
• After a short drive (5–10 minutes), shut the engine off and recheck the belt routing and tension visually.

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💰 DIY vs Shop Cost

Shop Cost: $180–$270 (parts + labor)

DIY Cost: $30–$80 (parts only)

You Save: $100–$200 by doing it yourself!

Shop labor rates vary but typically run $100–$150/hour. This repair takes a shop approximately 0.8–1.0 hours.

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