🔧 Tucson - Serpentine Belt Replacement

The serpentine (drive) belt runs your alternator, A/C compressor, and other accessories. Replacing it restores proper grip and prevents squealing, charging problems, or a sudden belt break.

Difficulty Level: Intermediate | Estimated Time: 0.8-1.5 hours

Assumption: Your Tucson has the factory automatic belt tensioner (common).

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⚠️ Safety & Precautions

• ⚠️ Work on a cold engine; belts and pulleys can burn you.
• ⚠️ Keep fingers and tools away from pulleys; never work with the engine running.
• ⚠️ If you raise the vehicle, support it with jack stands; never rely on a jack alone.
• ⚠️ Battery disconnect is not required, but remove the key and keep it away from the vehicle.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• LED work light
• Ratchet 3/8"
• Serpentine belt tool (specialty)
• 17mm socket
• 19mm socket
• 10mm socket
• 12mm socket
• Trim clip removal tool
• Flathead screwdriver
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Torque wrench 10-150 Nm

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1
• Accessory belt tensioner assembly - Qty: 1 (only if noisy/weak)
• Accessory belt idler pulley - Qty: 1 (only if noisy/rough)
• Engine splash shield fastener clips - Qty: 4 (optional, spares)

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• Open the hood and remove any loose clothing/jewelry.
• Take a clear photo of the belt routing, or draw a quick sketch before removing the belt.
• If access is tight from above, plan to remove the lower splash shield for a better view from underneath.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the top engine cover (if equipped)

• Pull upward firmly to release the rubber grommets, or remove bolts with a 10mm socket if yours is bolted on.
• Set the cover aside so you can see the belt area.

Step 2: (Optional) Remove the lower splash shield for access

• Lift the front safely using a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove plastic clips with a trim clip removal tool and/or loosen screws with a flathead screwdriver.
• If there are small bolts, remove them with a 10mm socket or 12mm socket.
• When reinstalling splash shield bolts: Torque to 8-10 Nm (71-89 in-lbs).

Step 3: Locate the belt tensioner and the “hex” for the tool

• Find the automatic belt tensioner (a spring-loaded arm with a pulley).
• Look for a hex head where you place a socket/ratchet to rotate the tensioner.
• Use a 17mm socket if it fits; if not, use a 19mm socket. (Some tensioners vary by supplier.)
• A belt tool is a thin, long ratchet. It helps in tight spaces.

Step 4: Relieve tension and remove the old belt

• Install your serpentine belt tool (specialty) or 3/8" ratchet with the correct 17mm socket or 19mm socket on the tensioner hex.
• Slowly rotate the tensioner to relieve belt tension (you are fighting the spring).
• While holding the tensioner rotated, slide the belt off the easiest-to-reach smooth pulley (often the idler or alternator pulley).
• Carefully let the tensioner return to its resting position. Do not let it snap back.
• Remove the belt from the remaining pulleys and pull it out.

Step 5: Inspect pulleys and tensioner before installing the new belt

• Spin each pulley by hand. It should feel smooth and quiet.
• If a pulley feels rough, wobbles, or makes a “grindy” sound, replace the idler pulley or tensioner assembly as needed.
• Check that pulley grooves are clean (no rocks or heavy rust).

Step 6: Route the new belt correctly

• Compare the new belt to the old one (length and rib count should match).
• Route the belt around the pulleys following your photo/sketch.
• Make sure the ribbed side sits fully in the grooved pulleys, and the smooth side sits on smooth pulleys.
• Leave one easy pulley for last (so you can slip it on while the tensioner is rotated).

Step 7: Apply tension and seat the belt

• Rotate the tensioner again using the serpentine belt tool (specialty) or 3/8" ratchet and the correct 17mm socket or 19mm socket.
• Slip the belt over the last pulley.
• Slowly release the tensioner so it tightens the belt.
• Double-check every pulley: the belt must be centered and fully seated in the grooves.
• If it’s off by one rib, fix it now.

Step 8: Reinstall covers/shields

• Reinstall the splash shield using the trim clip removal tool, flathead screwdriver, and 10mm socket/12mm socket as needed.
• Reinstall the engine cover by pressing it into the grommets, or tightening bolts with a 10mm socket.

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✅ After Repair

• Start the engine and let it idle for 30-60 seconds while you watch the belt track on the pulleys.
• Listen for squeal, chirp, or slapping sounds. Shut off immediately if the belt walks off a pulley.
• Turn the A/C on and verify no new noise starts under load.
• Recheck belt seating one more time with the engine off.

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💰 DIY vs Shop Cost

Shop Cost: $150-$350 (parts + labor)

DIY Cost: $30-$90 (parts only)

You Save: $120-$260 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.5 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.