How to Replace Idler Pulley 96-99 GMC Sierra K1500
Difficulty: Beginner · About 30 min · Gmc Sierra K1500
Replace the idler pulley on a 1996–1999 GMC Sierra K1500 and inspect the serpentine belt routing before restarting the engine.
Tools you will need
- 13mm Socket
- Torque Wrench
- 3/8 Inch Drive Ratchet
Parts and supplies
- Serpentine belt idler pulley
Steps
Relieve belt tension and remove the belt
With the engine off, note the belt routing diagram. Insert the ratchet into the tensioner, rotate it to relieve tension, slip the belt off a pulley, and release the tensioner slowly before removing the belt.
Remove the old idler pulley
Remove the pulley retaining bolt and lift the pulley from its mounting point. Check the mounting surface and belt for wear, contamination, or misalignment.
Install the replacement pulley
Seat the new pulley in the same orientation and start its bolt by hand. Tighten the bolt to the vehicle specification and spin the pulley to confirm it turns smoothly without excessive play.
Route the belt and verify tracking
Follow the routing diagram to place the belt around all pulleys, using the tensioner to create slack. Confirm every rib sits in its groove, then start the engine briefly and listen for squeal or wobble.
Check your vehicle’s repair manual for exact specifications and fit.