🔧 Explorer - Serpentine Belt Replacement

You’ll remove the old drive belt and install a new one, making sure it’s routed correctly on every pulley. A worn belt can squeal, slip, or crack, and if it breaks you can lose charging and cooling.

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

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⚠️ Safety & Precautions

• ⚠️ Work on a cool engine; belts/pulleys can burn you.
• ⚠️ Keep fingers, hair, and sleeves away from pulleys.
• ⚠️ Key off and keep the key/fob away so nobody can start it.
• ⚠️ If you’ll unplug the MAF sensor, disconnect the negative battery cable first (prevents a check engine light).

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 3/8" drive ratchet
• 3/8" drive breaker bar (18"-24")
• 3/8" drive 15mm socket
• 1/4" drive ratchet
• 8mm socket
• 10mm socket
• Flat-blade screwdriver
• Flashlight
• Belt installation tool (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1
• A/C stretch belt - Qty: 1 (if equipped)

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📋 Before You Begin

• 🧭 Park on level ground, shift to Park, and set the parking brake.
• 🔎 Find the belt routing diagram sticker (usually near the radiator support). If it’s missing, take a clear photo of the current routing.
• 🔌 If you plan to unplug any sensors: use a 10mm socket to disconnect the negative battery cable and isolate it.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Pull up firmly by hand to release the cover from its grommets.
• Set it aside where it won’t get stepped on.

Step 2: Open up access to the belt (intake tube as needed)

• Use an 8mm socket or flat-blade screwdriver to loosen the air intake hose clamps.
• If a connector is in the way, unplug it only after battery negative is disconnected; then press the tab and pull straight off.
• Move the intake tube/air ducting enough to clearly see the belt and the tensioner.

Step 3: Identify the belt tensioner

• Look for the spring-loaded arm with a smooth pulley (this is the automatic tensioner).
• The tensioner has a bolt head you’ll turn to relieve belt tension.
• Tensioner = spring-loaded belt “tightener”.

Step 4: Relieve tension and remove the old belt

• Install a 15mm socket on a 3/8" breaker bar and place it on the tensioner bolt head.
• Rotate the tensioner to relieve belt tension (you’ll feel spring resistance).
• While holding the tensioner rotated, slide the belt off one easy-to-reach pulley (often the alternator).
• Slowly release the tensioner back to its resting position (don’t let it snap back).
• Remove the belt from the remaining pulleys and take it out.

Step 5: Inspect pulleys and tensioner

• Spin the idler pulley and tensioner pulley by hand; they should spin smoothly and quietly.
• Check for wobble or grinding. If you feel roughness, that pulley may need replacement.

Step 6: Route the new belt

• Compare the new belt to the old belt for matching length and rib count.
• Route the new belt following the under-hood routing diagram (or your photo).
• Make sure the ribbed side of the belt sits in the grooved pulleys, and the smooth side sits on smooth pulleys.
• Leave the belt off one top pulley last (again, alternator is often easiest).
• Ribs must sit perfectly in grooves.

Step 7: Apply tension and fully seat the belt

• Use the 15mm socket and 3/8" breaker bar to rotate the tensioner again.
• Slide the belt onto the last pulley.
• Slowly release the tensioner.
• Use a flashlight to confirm the belt is centered on every pulley and not riding on an edge.

Step 8: If equipped: replace the separate A/C stretch belt

• Some Explorers may have a separate “stretch belt” for the A/C compressor (no tensioner).
• Use a belt installation tool (specialty) to install it without damaging the belt.
• Do not use a screwdriver to “walk” it on; that can cut the belt.
• Stretch belts are one-time-use on removal.

Step 9: Reinstall intake/cover

• Reinstall the intake tube and tighten clamps with an 8mm socket or flat-blade screwdriver.
• Reconnect any electrical connectors you unplugged.
• Reinstall the engine cover by pressing it down into the grommets.
• If disconnected, reconnect the battery negative using a 10mm socket.

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✅ After Repair

• 🔍 Start your Explorer and watch the belt for 30-60 seconds; it should run smoothly with no wandering.
• 👂 Listen for chirping/squealing. If present, shut it off and re-check routing and pulley alignment.
• 🧪 Turn on A/C and headlights to add load and confirm no belt slip noise.
• 🧰 Re-check clamp tightness and that no tools are left in the engine bay.

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💰 DIY vs Shop Cost

Shop Cost: $150-$280 (parts + labor)

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

You Save: $115-$195 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.6-1.0 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.