🔧 Wrangler - Serpentine Belt Replacement

The serpentine belt runs your A/C, alternator (battery charging), power steering, and more. On your Wrangler, you replace it by rotating the automatic belt tensioner (a spring-loaded pulley that keeps the belt tight), swapping the belt, then confirming the belt is seated in every pulley groove.

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

---

⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; keep hands clear of the fan and pulleys.
• ⚠️ Remove the key and keep it in your pocket so nobody can start it.
• ⚠️ Disconnect the negative battery cable if you want maximum safety around rotating parts.
• ⚠️ Release the tensioner slowly—spring force can pinch fingers.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 15mm socket
• 3/8" drive ratchet
• 3/8" drive breaker bar (18"-24")
• 3/8" drive extension (6")
• Serpentine belt tool (specialty)
• Flashlight
• Trim clip tool
• Work gloves
• Safety glasses

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1

---

📋 Before You Begin

• Park on level ground, set the parking brake, and put the transmission in neutral.
• Open the hood and use a flashlight to find the belt routing diagram (often on the fan shroud/under-hood area). If it’s missing, take a clear photo of the current routing before removal.
• If you choose to disconnect the battery: use the proper wrench for the terminal and remove the negative cable first, then tuck it aside so it can’t spring back.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Get access and inspect the belt path

• Use a flashlight and locate all pulleys (alternator, A/C, power steering, idlers, crank pulley).
• If any lower plastic splash shield is in the way, remove its clips using a trim clip tool.
• Take a photo now—big time saver.

Step 2: Relieve belt tension (rotate the tensioner)

• Put a 15mm socket on the belt tensioner’s hex/boss and attach a 3/8" drive ratchet (or breaker bar for more leverage).
• Rotate the tensioner to loosen the belt. (This is the spring-loaded arm; it will fight you.)
• If space is tight, use the serpentine belt tool (specialty) (a thin, long handled tool made for turning the tensioner in tight engine bays).
• No torque specs required for this step because you are not removing any bolts—only rotating the tensioner.

Step 3: Slip the old belt off one top pulley

• While holding the tensioner rotated with your 15mm socket and breaker bar, slide the belt off an easy-to-reach pulley (typically a smooth idler or the alternator pulley).
• Slowly let the tensioner return to its rest position. Do not let it snap back.

Step 4: Remove the old belt completely

• Pull the belt out of the remaining pulleys by hand.
• Compare the old belt to the new belt (length and rib count should match).

Step 5: Route the new belt on all pulleys (leave one for last)

• Using your photo/diagram, route the new belt around the crank pulley and other accessories.
• Make sure the ribbed side sits in ribbed pulleys and the smooth side rides on smooth pulleys.
• Leave the easiest top pulley for last (so you can slip it on while the tensioner is released).
• If one rib is off, it will shred fast.

Step 6: Re-apply tension and seat the belt

• Rotate the tensioner again using the 15mm socket and breaker bar.
• Slip the belt onto the last pulley, then slowly release the tensioner.
• Use your flashlight to check every pulley: the belt must be centered and fully seated in every groove.

Step 7: Reinstall any shields you removed

• If you removed any splash shield clips, reinstall them by hand and press them in using the trim clip tool.

---

✅ After Repair

• Start the engine and watch the belt for 20-30 seconds. It should run straight with no hopping, squeal, or wandering.
• Turn the steering wheel slightly and switch the A/C on to load the belt. Listen for chirps/squeals.
• Shut the engine off and do one last groove-by-groove check with a flashlight.

---

💰 DIY vs Shop Cost

Shop Cost: $120-$220 (parts + labor)

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

You Save: $90-$150 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.

---

🎯 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.