How to Replace Serpentine Belt Tensioner with Pulley 03-06 GMC Envoy XL

Difficulty: Intermediate · About 30 min · Gmc Envoy

Replace the serpentine belt tensioner and pulley on a 2003-2006 GMC Envoy XL.

Steps

1. Remove the air intake hose

   Disconnect the negative battery cable with an 8mm wrench, loosen the intake hose's two clamps with a flat blade screwdriver, remove the air box's T30 bolt, then remove the intake hose.

2. Remove the old tensioner

   Familiarize yourself with the belt's routing, fit a 15mm socket and ratchet into the tensioner, turn it to pull the belt off the center pulley, release the tensioner, pull the belt off by hand, then remove the tensioner's three 15mm bolts.

3. Install the new tensioner

   Insert it into place and hand-tighten one bolt, tighten the 15mm bolts, pull the belt up and over the alternator and tensioner, seat it on each pulley following the diagram, pull the tensioner clockwise with the 15mm socket to seat the belt, release it, then confirm the belt sits on the correct pulleys.

4. Reinstall the air intake hose

   Insert it into place, tighten its two hose clamps with a flat blade screwdriver, insert and tighten the T30 Torx bolt, then reconnect the negative battery cable with the 8mm wrench.

Check your vehicle’s repair manual for exact specifications and fit.