🔧 Armada - Serpentine Belt Replacement

The serpentine belt drives key accessories like the alternator and A/C. Replacing it means releasing the spring-loaded belt tensioner, swapping the belt, then confirming the belt is routed correctly on every pulley.

Difficulty Level: Intermediate | Estimated Time: 0.5-1.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cold engine; hot pulleys burn.
• ⚠️ Keep fingers, hair, and clothing away from the belt path.
• ⚠️ Do not start the engine until the belt is fully seated on every pulley.
• ⚠️ If you remove the negative battery cable, you may lose radio clock settings.

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🔧 Required Tools

You'll need the following tools for this repair:

• 14mm serpentine belt tool
• 14mm combination wrench
• 10mm socket
• 3/8" drive ratchet
• 6" extension (3/8" drive)
• Flat-blade screwdriver
• Flashlight
• Mechanic gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1
• Serpentine belt tensioner assembly - Qty: 1 (optional if noisy/weak)
• Idler pulley - Qty: 1 (optional if noisy/rough)

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine cool fully.
• Find the belt routing diagram (often on a sticker under the hood). If you don’t see one, take a clear photo of the current belt routing before removal.
• If you choose to disconnect the battery: use a 10mm socket to remove the negative terminal first. Torque to 5 Nm (44 in-lbs) when reinstalling.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Get access to the belt area

• Remove the plastic engine cover if it blocks your view: use a 10mm socket and 3/8" drive ratchet where applicable, then lift it off.
• If the intake duct/snorkel is in the way, loosen clamps using a flat-blade screwdriver and reposition it slightly for room.
• Use a flashlight to locate the belt tensioner (the spring-loaded arm with a pulley).

Step 2: Confirm belt routing before removal

• Look for a routing sticker under the hood and compare it to what you see.
• If there’s no sticker, take a photo from above with your phone.
• Photo now saves big confusion later.

Step 3: Release belt tension (tensioner)

• Put a 14mm serpentine belt tool (or 14mm combination wrench) on the tensioner’s hex.
• Slowly rotate the tensioner to relieve tension. (It’s spring-loaded, meaning it “pushes back” on you.)
• While holding the tensioner rotated, slide the belt off the easiest-to-reach smooth pulley (often the idler or tensioner pulley) using your free hand.

Step 4: Remove the old belt

• Let the tensioner return slowly to its resting position (do not let it snap back).
• Pull the belt out around the fan shroud area carefully.
• If your Armada has a large engine-driven fan, rotate the fan by hand to help “walk” the belt out while guiding it with your hands (engine OFF, key away).

Step 5: Quick pulley and tensioner check

• Spin the idler and tensioner pulleys by hand. They should feel smooth and quiet (no grinding, wobble, or rough spots).
• If any pulley feels rough or noisy, plan to replace that pulley/tensioner before installing the new belt.

Step 6: Route the new belt

• Match your routing photo/sticker and route the new belt around the crank pulley first, then the other accessories.
• Make sure the “ribbed” side of the belt sits in the grooved pulleys, and the smooth side rides on smooth pulleys.
• Leave one easy pulley for last (an upper smooth pulley is usually easiest) so you can slip it on after releasing tension.

Step 7: Apply tension and seat the belt

• Rotate the tensioner again using the 14mm serpentine belt tool (or 14mm combination wrench).
• Slip the belt onto the last pulley.
• Slowly release the tensioner so it applies tension to the belt.
• Visually check every pulley: the belt ribs must sit centered in the grooves with no overhang.

Step 8: Reinstall anything you removed

• Reinstall the intake duct and tighten clamps using the flat-blade screwdriver.
• Reinstall the engine cover using the 10mm socket and 3/8" drive ratchet.
• If disconnected, reconnect the battery negative terminal using the 10mm socket. Torque to 5 Nm (44 in-lbs).

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✅ After Repair

• Before starting: do one final belt alignment check on all pulleys with a flashlight.
• Start the engine and watch the belt for 20–30 seconds. It should run straight with no wobble or chirping.
• Turn A/C on and headlights on to load the belt, then listen for squeal.
• Shut the engine off and re-check belt seating one more time.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $35-$90 (parts only)

You Save: $145-$260 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.7-1.2 hours.

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🎯 Ready to get started?

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