🔧 Grand Cherokee - Serpentine Belt Replacement

The serpentine belt drives important accessories like the alternator, power steering, water pump, and A/C compressor on your Grand Cherokee. Replacing it is usually straightforward, but correct belt routing is critical so every pulley spins the right way.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

---

⚠️ Safety & Precautions

• ⚠️ Work only with the engine completely off and cool.
• ⚠️ Keep hands, hair, sleeves, and tools away from the belt path.
• ⚠️ Do not start the engine until the belt is fully seated in every pulley groove.
• ⚠️ Disconnecting the battery is recommended because you will be working near rotating engine parts. Remove the negative cable first.
• ⚠️ The belt tensioner is spring-loaded. A tensioner is a pulley arm that keeps the belt tight; it can snap back if released suddenly.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 3/8-inch drive serpentine belt tool (specialty)
• 3/8-inch drive breaker bar
• 15mm socket
• 10mm socket
• Ratchet wrench with 3/8-inch drive
• Flat-blade screwdriver
• Work light
• Safety glasses
• Mechanic gloves

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine drive belt - Qty: 1

---

📋 Before You Begin

• 🅿️ Park your Grand Cherokee on level ground and shift to Park.
• 🅿️ Set the parking brake firmly.
• ❄️ Let the engine cool completely before reaching near the belt and pulleys.
• 📸 Take a clear photo of the old belt routing before removal. This is your backup map.
• 🔋 Use a 10mm socket to loosen the negative battery terminal, then move the cable aside so it cannot touch the battery post.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the Hood and Locate the Belt

• Use the hood release inside the cabin, then lift the hood and secure it.
• Use a work light to find the serpentine belt at the front of the engine.
• Look for the belt routing decal under the hood or on the radiator support. This diagram shows the belt path around each pulley.
• If the decal is missing or unreadable, use your phone photo as the routing reference.

Step 2: Identify the Belt Tensioner

• Use the work light to locate the automatic belt tensioner. It has a smooth pulley mounted on a spring-loaded arm.
• The tensioner on your Grand Cherokee is released by rotating the tensioner arm with a 3/8-inch drive tool or a socket on the tensioner bolt, depending on access.
• A serpentine belt tool is a long, thin handle that gives extra reach in tight engine spaces.

Step 3: Release Belt Tension

• Put on safety glasses and mechanic gloves.
• Install the 3/8-inch drive serpentine belt tool or 3/8-inch drive breaker bar into the tensioner square-drive opening if equipped.
• If using the tensioner pulley bolt, place the 15mm socket and 3/8-inch drive breaker bar on the tensioner bolt.
• Slowly rotate the tensioner away from the belt to remove belt tension.
• While holding the tensioner back, slide the belt off one easy-to-reach smooth pulley first.
• Slowly release the tensioner back to its resting position. Do not let it snap back.
• Move slowly; the spring is strong.

Step 4: Remove the Old Belt

• Use your hands to pull the belt off the remaining pulleys.
• If the belt is stuck in a pulley groove, use a flat-blade screwdriver gently to lift it free.
• Do not pry hard against plastic pulleys or pulley seals.
• Remove the belt from the engine bay.

Step 5: Inspect the Pulleys Before Installing the New Belt

• Use your hand to spin the smooth idler pulleys and tensioner pulley.
• They should spin smoothly without grinding, wobbling, or rough spots.
• Look at the grooved pulleys. The grooves should be clean and not packed with rubber dust.
• If a pulley wobbles, grinds, or feels loose, replace that pulley before installing the new belt.

Step 6: Compare the New Belt to the Old Belt

• Lay the old and new serpentine belts side by side.
• The new belt should be the same width and very close in length.
• A slightly shorter new belt is normal because the old belt can stretch with age.

Step 7: Route the New Belt Around the Pulleys

• Use your belt routing photo or the under-hood diagram.
• Start by routing the new belt around the lower pulleys first.
• Make sure the ribbed side of the belt sits in grooved pulleys.
• Make sure the smooth back side of the belt rides on smooth pulleys.
• Leave one upper smooth pulley for last because it is usually easiest to slip the belt over.
• Ribs go into grooves.

Step 8: Release the Tensioner Again

• Use the 3/8-inch drive serpentine belt tool, 3/8-inch drive breaker bar, or 15mm socket as used during removal.
• Rotate the tensioner away from the belt path.
• Slide the belt over the final pulley.
• Slowly release the tensioner until it applies tension to the belt.

Step 9: Check Belt Alignment

• Use the work light to inspect every pulley.
• The belt must sit centered on each pulley.
• Each belt rib must sit inside the matching pulley groove.
• If the belt is one rib off, use the tensioner tool again and reposition it before starting the engine.

Step 10: Reconnect the Battery

• Place the negative battery cable back onto the negative battery post.
• Use the 10mm socket and ratchet wrench with 3/8-inch drive to tighten the terminal clamp snugly.
• Do not overtighten the battery terminal clamp.

Step 11: Start and Observe

• Start the engine and let it idle.
• Use the work light to watch the belt from a safe distance.
• The belt should run smoothly with no wobble, squeal, flap, or walking off the pulleys.
• Turn the engine off immediately if the belt jumps, squeals loudly, or appears misaligned.

---

✅ After Repair

• ✅ Let the engine idle for 1-2 minutes, then shut it off and recheck belt position.
• ✅ Check that the battery warning light is off.
• ✅ Check that steering assist, A/C operation, and charging system behavior are normal.
• ✅ After a short test drive, inspect the belt again with the engine off.
• ✅ If you hear chirping or squealing, recheck belt routing, pulley alignment, and tensioner condition.

---

💰 DIY vs Shop Cost

Shop Cost: $160-$300 USD equivalent (parts + labor)

DIY Cost: $35-$85 USD equivalent (parts only)

You Save: $125-$215 USD equivalent by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hour.

---

🎯 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.